Ćirković, Predrag

 Authority Key Name Variants orcid::0000-0002-5865-1952 Ćirković, Predrag (540)

### Author's Bibliography

#### Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9703
AB  - The rate for Higgs (H) bosons production in association with either one (t H) or two (t t ¯ H) top quarks is measured in final states containing multiple electrons, muons, or tau leptons decaying to hadrons and a neutrino, using proton–proton collisions recorded at a center-of-mass energy of 13Te by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137fb-1. The analysis is aimed at events that contain H → W W , H → τ τ , or H → Z Z decays and each of the top quark(s) decays either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis, depending on the lepton multiplicity. The separation among t H , t t ¯ H , and the backgrounds is enhanced through machine-learning techniques and matrix-element methods. The measured production rates for the t t ¯ H and t H signals correspond to 0.92±0.19(stat)-0.13+0.17(syst) and 5.7±2.7(stat)±3.0(syst) of their respective standard model (SM) expectations. The corresponding observed (expected) significance amounts to 4.7 (5.2) standard deviations for t t ¯ H , and to 1.4 (0.3) for t H production. Assuming that the Higgs boson coupling to the tau lepton is equal in strength to its expectation in the SM, the coupling yt of the Higgs boson to the top quark divided by its SM expectation, κt=yt/ytSM, is constrained to be within - 0.9 < κt< - 0.7 or 0.7 < κt< 1.1 , at 95% confidence level. This result is the most sensitive measurement of the t t ¯ H production rate to date.
T2  - European Physical Journal C
T1  - Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te
VL  - 81
IS  - 4
SP  - 378
DO  - 10.1140/epjc/s10052-021-09014-x
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "The rate for Higgs (H) bosons production in association with either one (t H) or two (t t ¯ H) top quarks is measured in final states containing multiple electrons, muons, or tau leptons decaying to hadrons and a neutrino, using proton–proton collisions recorded at a center-of-mass energy of 13Te by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137fb-1. The analysis is aimed at events that contain H → W W , H → τ τ , or H → Z Z decays and each of the top quark(s) decays either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis, depending on the lepton multiplicity. The separation among t H , t t ¯ H , and the backgrounds is enhanced through machine-learning techniques and matrix-element methods. The measured production rates for the t t ¯ H and t H signals correspond to 0.92±0.19(stat)-0.13+0.17(syst) and 5.7±2.7(stat)±3.0(syst) of their respective standard model (SM) expectations. The corresponding observed (expected) significance amounts to 4.7 (5.2) standard deviations for t t ¯ H , and to 1.4 (0.3) for t H production. Assuming that the Higgs boson coupling to the tau lepton is equal in strength to its expectation in the SM, the coupling yt of the Higgs boson to the top quark divided by its SM expectation, κt=yt/ytSM, is constrained to be within - 0.9 < κt< - 0.7 or 0.7 < κt< 1.1 , at 95% confidence level. This result is the most sensitive measurement of the t t ¯ H production rate to date.",
journal = "European Physical Journal C",
title = "Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te",
volume = "81",
number = "4",
pages = "378",
doi = "10.1140/epjc/s10052-021-09014-x"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te. in European Physical Journal C, 81(4), 378.
https://doi.org/10.1140/epjc/s10052-021-09014-x
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te. in European Physical Journal C. 2021;81(4):378.
doi:10.1140/epjc/s10052-021-09014-x .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at √s=13Te" in European Physical Journal C, 81, no. 4 (2021):378,
https://doi.org/10.1140/epjc/s10052-021-09014-x . .
 2 5

#### Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5)

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9653
AB  - A Correction to this paper has been published: https://doi.org/10.1140/epjc/s10052-020-08739-5
T2  - European Physical Journal C
T1  - Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5)
VL  - 81
IS  - 4
SP  - 333
DO  - 10.1140/epjc/s10052-021-08959-3
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "A Correction to this paper has been published: https://doi.org/10.1140/epjc/s10052-020-08739-5",
journal = "European Physical Journal C",
title = "Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5)",
volume = "81",
number = "4",
pages = "333",
doi = "10.1140/epjc/s10052-021-08959-3"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5). in European Physical Journal C, 81(4), 333.
https://doi.org/10.1140/epjc/s10052-021-08959-3
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5). in European Physical Journal C. 2021;81(4):333.
doi:10.1140/epjc/s10052-021-08959-3 .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te (The European Physical Journal C, (2021), 81, 1, (13), 10.1140/epjc/s10052-020-08739-5)" in European Physical Journal C, 81, no. 4 (2021):333,
https://doi.org/10.1140/epjc/s10052-021-08959-3 . .
 1 1

#### Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9651
AB  - Measurements are presented of differential cross sections for the production of Z bosons in association with at least one jet initiated by a charm quark in pp collisions at s = 13 TeV. The data recorded by the CMS experiment at the LHC correspond to an integrated luminosity of 35.9 fb−1. The final states contain a pair of electrons or muons that are the decay products of a Z boson, and a jet consistent with being initiated by a charm quark produced in the hard interaction. Differential cross sections as a function of the transverse momentum pT of the Z boson and pT of the charm jet are compared with predictions from Monte Carlo event generators. The inclusive production cross section 405.4 ± 5.6 (stat) ± 24.3 (exp) ± 3.7 (theo) pb, is measured in a fiducial region requiring both leptons to have pseudorapidity |η| < 2.4 and pT> 10 GeV, at least one lepton with pT> 26 GeV, and a mass of the pair in the range 71–111 GeV, while the charm jet is required to have pT> 30 GeV and |η| < 2.4. These are the first measurements of these cross sections in proton-proton collisions at 13 TeV.
T2  - Journal of High Energy Physics
T1  - Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV
VL  - 2021
IS  - 4
SP  - 109
DO  - 10.1007/JHEP04(2021)109
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "Measurements are presented of differential cross sections for the production of Z bosons in association with at least one jet initiated by a charm quark in pp collisions at s = 13 TeV. The data recorded by the CMS experiment at the LHC correspond to an integrated luminosity of 35.9 fb−1. The final states contain a pair of electrons or muons that are the decay products of a Z boson, and a jet consistent with being initiated by a charm quark produced in the hard interaction. Differential cross sections as a function of the transverse momentum pT of the Z boson and pT of the charm jet are compared with predictions from Monte Carlo event generators. The inclusive production cross section 405.4 ± 5.6 (stat) ± 24.3 (exp) ± 3.7 (theo) pb, is measured in a fiducial region requiring both leptons to have pseudorapidity |η| < 2.4 and pT> 10 GeV, at least one lepton with pT> 26 GeV, and a mass of the pair in the range 71–111 GeV, while the charm jet is required to have pT> 30 GeV and |η| < 2.4. These are the first measurements of these cross sections in proton-proton collisions at 13 TeV.",
journal = "Journal of High Energy Physics",
title = "Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV",
volume = "2021",
number = "4",
pages = "109",
doi = "10.1007/JHEP04(2021)109"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV. in Journal of High Energy Physics, 2021(4), 109.
https://doi.org/10.1007/JHEP04(2021)109
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV. in Journal of High Energy Physics. 2021;2021(4):109.
doi:10.1007/JHEP04(2021)109 .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV" in Journal of High Energy Physics, 2021, no. 4 (2021):109,
https://doi.org/10.1007/JHEP04(2021)109 . .
 1

#### Development and validation of HERWIG 7 tunes from CMS underlying-event measurements

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9649
AB  - This paper presents new sets of parameters (“tunes”) for the underlying-event model of the  $${\textsc {herwig}} \,7$$     H E R W I G   7     event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in  $${\textsc {herwig}} \,7$$     H E R W I G   7    , and are obtained from a fit to minimum-bias data collected by the CMS experiment at  $$\sqrt{s}=0.9$$     s  = 0.9    , 7, and  $$13 \,\text {Te}\text {V}$$    13   Te      . The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the data.
T2  - European Physical Journal C
T1  - Development and validation of HERWIG 7 tunes from CMS underlying-event measurements
VL  - 81
IS  - 4
SP  - 312
DO  - 10.1140/epjc/s10052-021-08949-5
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "This paper presents new sets of parameters (“tunes”) for the underlying-event model of the  $${\textsc {herwig}} \,7$$     H E R W I G   7     event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in  $${\textsc {herwig}} \,7$$     H E R W I G   7    , and are obtained from a fit to minimum-bias data collected by the CMS experiment at  $$\sqrt{s}=0.9$$     s  = 0.9    , 7, and  $$13 \,\text {Te}\text {V}$$    13   Te      . The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the data.",
journal = "European Physical Journal C",
title = "Development and validation of HERWIG 7 tunes from CMS underlying-event measurements",
volume = "81",
number = "4",
pages = "312",
doi = "10.1140/epjc/s10052-021-08949-5"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Development and validation of HERWIG 7 tunes from CMS underlying-event measurements. in European Physical Journal C, 81(4), 312.
https://doi.org/10.1140/epjc/s10052-021-08949-5
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Development and validation of HERWIG 7 tunes from CMS underlying-event measurements. in European Physical Journal C. 2021;81(4):312.
doi:10.1140/epjc/s10052-021-08949-5 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Development and validation of HERWIG 7 tunes from CMS underlying-event measurements" in European Physical Journal C, 81, no. 4 (2021):312,
https://doi.org/10.1140/epjc/s10052-021-08949-5 . .
 1 1

#### Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9147
AB  - A search is presented for a Higgs boson that is produced via vector boson fusion and that decays to an undetected particle and an isolated photon. The search is performed by the CMS collaboration at the LHC, using a data set corresponding to an integrated luminosity of 130 fb −1, recorded at a center-of-mass energy of 13 TeV in 2016–2018. No significant excess of events above the expectation from the standard model background is found. The results are interpreted in the context of a theoretical model in which the undetected particle is a massless dark photon. An upper limit is set on the product of the cross section for production via vector boson fusion and the branching fraction for such a Higgs boson decay, as a function of the Higgs boson mass. For a Higgs boson mass of 125 GeV, assuming the standard model production rates, the observed (expected) 95% confidence level upper limit on the branching fraction is 3.5 (2.8)%. This is the first search for such decays in the vector boson fusion channel. Combination with a previous search for Higgs bosons produced in association with a Z boson results in an observed (expected) upper limit on the branching fraction of 2.9 (2.1)% at 95% confidence level.
T2  - Journal of High Energy Physics
T1  - Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV
VL  - 2021
IS  - 3
SP  - 11
DO  - 10.1007/JHEP03(2021)011
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "A search is presented for a Higgs boson that is produced via vector boson fusion and that decays to an undetected particle and an isolated photon. The search is performed by the CMS collaboration at the LHC, using a data set corresponding to an integrated luminosity of 130 fb −1, recorded at a center-of-mass energy of 13 TeV in 2016–2018. No significant excess of events above the expectation from the standard model background is found. The results are interpreted in the context of a theoretical model in which the undetected particle is a massless dark photon. An upper limit is set on the product of the cross section for production via vector boson fusion and the branching fraction for such a Higgs boson decay, as a function of the Higgs boson mass. For a Higgs boson mass of 125 GeV, assuming the standard model production rates, the observed (expected) 95% confidence level upper limit on the branching fraction is 3.5 (2.8)%. This is the first search for such decays in the vector boson fusion channel. Combination with a previous search for Higgs bosons produced in association with a Z boson results in an observed (expected) upper limit on the branching fraction of 2.9 (2.1)% at 95% confidence level.",
journal = "Journal of High Energy Physics",
title = "Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV",
volume = "2021",
number = "3",
pages = "11",
doi = "10.1007/JHEP03(2021)011"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics, 2021(3), 11.
https://doi.org/10.1007/JHEP03(2021)011
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics. 2021;2021(3):11.
doi:10.1007/JHEP03(2021)011 .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV" in Journal of High Energy Physics, 2021, no. 3 (2021):11,
https://doi.org/10.1007/JHEP03(2021)011 . .
 1

#### Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9513
AB  - A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton–proton collision data at a center-of-mass energy of 13Te, collected by the CMS experiment at the LHC in 2016–2018, corresponding to an integrated luminosity of 137fb-1. The search uses the decay channels Z → e e and Z → μ μ. No significant excess of events is observed over the background expected from the standard model. Limits are set on dark matter particle production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as on a two-Higgs-doublet model with an additional pseudoscalar mediator. In addition, limits are provided for spin-dependent and spin-independent scattering cross sections and are compared to those from direct-detection experiments. The results are also interpreted in the context of models of invisible Higgs boson decays, unparticles, and large extra dimensions.
T2  - European Physical Journal C
T1  - Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te
VL  - 81
IS  - 1
SP  - 13
DO  - 10.1140/epjc/s10052-020-08739-5
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton–proton collision data at a center-of-mass energy of 13Te, collected by the CMS experiment at the LHC in 2016–2018, corresponding to an integrated luminosity of 137fb-1. The search uses the decay channels Z → e e and Z → μ μ. No significant excess of events is observed over the background expected from the standard model. Limits are set on dark matter particle production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as on a two-Higgs-doublet model with an additional pseudoscalar mediator. In addition, limits are provided for spin-dependent and spin-independent scattering cross sections and are compared to those from direct-detection experiments. The results are also interpreted in the context of models of invisible Higgs boson decays, unparticles, and large extra dimensions.",
journal = "European Physical Journal C",
title = "Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te",
volume = "81",
number = "1",
pages = "13",
doi = "10.1140/epjc/s10052-020-08739-5"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te. in European Physical Journal C, 81(1), 13.
https://doi.org/10.1140/epjc/s10052-020-08739-5
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te. in European Physical Journal C. 2021;81(1):13.
doi:10.1140/epjc/s10052-020-08739-5 .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13Te" in European Physical Journal C, 81, no. 1 (2021):13,
https://doi.org/10.1140/epjc/s10052-020-08739-5 . .
 4 4

#### Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9622
AB  - A measurement is reported of differential top quark pair (tt¯) production cross sections, where top quarks are produced at large transverse momenta. The data collected with the CMS detector at the LHC are from pp collisions at a center-of-mass energy of 13  TeV corresponding to an integrated luminosity of 35.9  fb−1. The measurement uses events where at least one top quark decays as t→Wb→qq¯′b and is reconstructed as a large-radius jet with transverse momentum in excess of 400 GeV. The second top quark is required to decay either in a similar way or leptonically, as inferred from a reconstructed electron or muon, a bottom quark jet, and missing transverse momentum due to the undetected neutrino. The cross section is extracted as a function of kinematic variables of individual top quarks or of the tt¯ system. The results are presented at the particle level, within a region of phase space close to that of the experimental acceptance, and at the parton level and are compared to various theoretical models. In both decay channels, the observed absolute cross sections are significantly lower than the predictions from theory, while the normalized differential measurements are well described.
T2  - Physical Review D
T1  - Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV
VL  - 103
SP  - 052008
DO  - 10.1103/PhysRevD.103.052008
ER  - 
@article{
author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2021",
abstract = "A measurement is reported of differential top quark pair (tt¯) production cross sections, where top quarks are produced at large transverse momenta. The data collected with the CMS detector at the LHC are from pp collisions at a center-of-mass energy of 13  TeV corresponding to an integrated luminosity of 35.9  fb−1. The measurement uses events where at least one top quark decays as t→Wb→qq¯′b and is reconstructed as a large-radius jet with transverse momentum in excess of 400 GeV. The second top quark is required to decay either in a similar way or leptonically, as inferred from a reconstructed electron or muon, a bottom quark jet, and missing transverse momentum due to the undetected neutrino. The cross section is extracted as a function of kinematic variables of individual top quarks or of the tt¯ system. The results are presented at the particle level, within a region of phase space close to that of the experimental acceptance, and at the parton level and are compared to various theoretical models. In both decay channels, the observed absolute cross sections are significantly lower than the predictions from theory, while the normalized differential measurements are well described.",
journal = "Physical Review D",
title = "Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV",
volume = "103",
pages = "052008",
doi = "10.1103/PhysRevD.103.052008"
}
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2021). Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV. in Physical Review D, 103, 052008.
https://doi.org/10.1103/PhysRevD.103.052008
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV. in Physical Review D. 2021;103:052008.
doi:10.1103/PhysRevD.103.052008 .
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Measurement of differential tt¯ production cross sections using top quarks at large transverse momenta in pp collisions at s=13TeV" in Physical Review D, 103 (2021):052008,
https://doi.org/10.1103/PhysRevD.103.052008 . .
 6 1 1

#### Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies

(2021)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9573
AB  - Measurements of the second Fourier harmonic coefficient (v2) of the azimuthal distributions of prompt and nonprompt D$^{0}$ mesons produced in pp and pPb collisions are presented. Nonprompt D$^{0}$ mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum (pT) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D$^{0}$ meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty hadrons are extracted for the first time via nonprompt D$^{0}$ mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D$^{0}$ mesons is smaller than that for prompt D$^{0}$ mesons. These new measurements indicate a positive charm hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.
T2  - Physics Letters B
T1  - Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies
VL  - 813 C
DO  - 10.1016/j.physletb.2020.136036
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2021",
abstract = "Measurements of the second Fourier harmonic coefficient (v2) of the azimuthal distributions of prompt and nonprompt D$^{0}$ mesons produced in pp and pPb collisions are presented. Nonprompt D$^{0}$ mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum (pT) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D$^{0}$ meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty hadrons are extracted for the first time via nonprompt D$^{0}$ mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D$^{0}$ mesons is smaller than that for prompt D$^{0}$ mesons. These new measurements indicate a positive charm hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.",
journal = "Physics Letters B",
title = "Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies",
volume = "813 C",
doi = "10.1016/j.physletb.2020.136036"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2021). Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies. in Physics Letters B, 813 C.
https://doi.org/10.1016/j.physletb.2020.136036
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies. in Physics Letters B. 2021;813 C.
doi:10.1016/j.physletb.2020.136036 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies" in Physics Letters B, 813 C (2021),
https://doi.org/10.1016/j.physletb.2020.136036 . .
 1 1 1

#### Evidence for Higgs boson decay to a pair of muons

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9551
AB  - Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair. The analysis is performed using proton-proton collision data at     s    $$\sqrt{s}$$  = 13 TeV, corresponding to an integrated luminosity of 137 fb −1, recorded by the CMS experiment at the CERN LHC. An excess of events over the back- ground expectation is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with mass of 125.38 GeV is 2.5. The combination of this result with that from data recorded at     s    $$\sqrt{s}$$  = 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb −1, respectively, increases both the expected and observed significances by 1%. The measured signal strength, relative to the SM prediction, is     1.19  − 0.39   + 0.40     stat   − 0.14   + 0.15    syst    $${1.19}_{-0.39}^{+0.40}{\left(\mathrm{stat}\right)}_{-0.14}^{+0.15}\left(\mathrm{syst}\right)$$ . This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date.
T2  - Journal of High Energy Physics
T1  - Evidence for Higgs boson decay to a pair of muons
VL  - 2021
IS  - 1
SP  - 148
DO  - 10.1007/JHEP01(2021)148
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair. The analysis is performed using proton-proton collision data at     s    $$\sqrt{s}$$  = 13 TeV, corresponding to an integrated luminosity of 137 fb −1, recorded by the CMS experiment at the CERN LHC. An excess of events over the back- ground expectation is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with mass of 125.38 GeV is 2.5. The combination of this result with that from data recorded at     s    $$\sqrt{s}$$  = 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb −1, respectively, increases both the expected and observed significances by 1%. The measured signal strength, relative to the SM prediction, is     1.19  − 0.39   + 0.40     stat   − 0.14   + 0.15    syst    $${1.19}_{-0.39}^{+0.40}{\left(\mathrm{stat}\right)}_{-0.14}^{+0.15}\left(\mathrm{syst}\right)$$ . This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date.",
journal = "Journal of High Energy Physics",
title = "Evidence for Higgs boson decay to a pair of muons",
volume = "2021",
number = "1",
pages = "148",
doi = "10.1007/JHEP01(2021)148"
}
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Evidence for Higgs boson decay to a pair of muons. in Journal of High Energy Physics, 2021(1), 148.
https://doi.org/10.1007/JHEP01(2021)148
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Evidence for Higgs boson decay to a pair of muons. in Journal of High Energy Physics. 2021;2021(1):148.
doi:10.1007/JHEP01(2021)148 .
Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Evidence for Higgs boson decay to a pair of muons" in Journal of High Energy Physics, 2021, no. 1 (2021):148,
https://doi.org/10.1007/JHEP01(2021)148 . .
 9 8 15

#### Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9550
AB  - Results are reported from a search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at     s    $$\sqrt{\mathrm{s}}$$  = 13 TeV. The data sample corresponds to an integrated luminosity of 33.2 fb −1 recorded by the CMS experiment at the LHC in 2016. The search exploits τ leptons produced in both W boson and heavy-flavor hadron decays. No significant excess above the expected background is observed. An upper limit on the branching fraction ℬ(τ → 3μ) of 8.0 × 10 −8 at 90% confidence level is obtained, with an expected upper limit of 6.9 × 10 −8.
T2  - Journal of High Energy Physics
T1  - Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV
VL  - 2021
IS  - 1
SP  - 163
DO  - 10.1007/JHEP01(2021)163
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "Results are reported from a search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at     s    $$\sqrt{\mathrm{s}}$$  = 13 TeV. The data sample corresponds to an integrated luminosity of 33.2 fb −1 recorded by the CMS experiment at the LHC in 2016. The search exploits τ leptons produced in both W boson and heavy-flavor hadron decays. No significant excess above the expected background is observed. An upper limit on the branching fraction ℬ(τ → 3μ) of 8.0 × 10 −8 at 90% confidence level is obtained, with an expected upper limit of 6.9 × 10 −8.",
journal = "Journal of High Energy Physics",
title = "Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV",
volume = "2021",
number = "1",
pages = "163",
doi = "10.1007/JHEP01(2021)163"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics, 2021(1), 163.
https://doi.org/10.1007/JHEP01(2021)163
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics. 2021;2021(1):163.
doi:10.1007/JHEP01(2021)163 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeV" in Journal of High Energy Physics, 2021, no. 1 (2021):163,
https://doi.org/10.1007/JHEP01(2021)163 . .
 1 2 1

#### Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Asilar, E.
AU  - Ćirković, Predrag
AU  - Devetak, Damir
AU  - Đorđević, Miloš
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9539
AB  - Event-by-event long-range correlations of azimuthal anisotropy Fourier coefficients (vn) in 8.16 TeV pPb data, collected by the CMS experiment at the CERN Large Hadron Collider, are extracted using a subevent four-particle cumulant technique applied to very low multiplicity events. Each combination of four charged particles is selected from either two, three, or four distinct subevent regions of a pseudorapidity range from −2.4 to 2.4 of the CMS tracker, and with transverse momentum between 0.3 and 3.0 GeV. Using the subevent cumulant technique, correlations between vn of different orders are measured as functions of particle multiplicity and compared to the standard cumulant method without subevents over a wide event multiplicity range. At high multiplicities, the v2 and v3 coefficients exhibit an anticorrelation; this behavior is observed consistently using various methods. The v2 and v4 correlation strength is found to depend on the number of subevents used in the calculation. As the event multiplicity decreases, the results from different subevent methods diverge because of different contributions of noncollective or few-particle correlations. Correlations extracted with the four-subevent method exhibit a tendency to diminish monotonically toward the lowest multiplicity region (about 20 charged tracks) investigated. These findings extend previous studies to a significantly lower event multiplicity range and establish the evidence for the onset of long-range collective multiparticle correlations in small system collisions.
T2  - Physical Review C
T1  - Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV
VL  - 103
DO  - 10.1103/PhysRevC.103.014902
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Adžić, Petar and Ćirković, Predrag and Devetak, Damir and Đorđević, Miloš and Milošević, Jovan",
year = "2021",
abstract = "Event-by-event long-range correlations of azimuthal anisotropy Fourier coefficients (vn) in 8.16 TeV pPb data, collected by the CMS experiment at the CERN Large Hadron Collider, are extracted using a subevent four-particle cumulant technique applied to very low multiplicity events. Each combination of four charged particles is selected from either two, three, or four distinct subevent regions of a pseudorapidity range from −2.4 to 2.4 of the CMS tracker, and with transverse momentum between 0.3 and 3.0 GeV. Using the subevent cumulant technique, correlations between vn of different orders are measured as functions of particle multiplicity and compared to the standard cumulant method without subevents over a wide event multiplicity range. At high multiplicities, the v2 and v3 coefficients exhibit an anticorrelation; this behavior is observed consistently using various methods. The v2 and v4 correlation strength is found to depend on the number of subevents used in the calculation. As the event multiplicity decreases, the results from different subevent methods diverge because of different contributions of noncollective or few-particle correlations. Correlations extracted with the four-subevent method exhibit a tendency to diminish monotonically toward the lowest multiplicity region (about 20 charged tracks) investigated. These findings extend previous studies to a significantly lower event multiplicity range and establish the evidence for the onset of long-range collective multiparticle correlations in small system collisions.",
journal = "Physical Review C",
title = "Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV",
volume = "103",
doi = "10.1103/PhysRevC.103.014902"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Adžić, P., Ćirković, P., Devetak, D., Đorđević, M.,& Milošević, J.. (2021). Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV. in Physical Review C, 103.
https://doi.org/10.1103/PhysRevC.103.014902
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Asilar E, Adžić P, Ćirković P, Devetak D, Đorđević M, Milošević J. Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV. in Physical Review C. 2021;103.
doi:10.1103/PhysRevC.103.014902 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Adžić, Petar, Ćirković, Predrag, Devetak, Damir, Đorđević, Miloš, Milošević, Jovan, "Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at sNN=8.16TeV" in Physical Review C, 103 (2021),
https://doi.org/10.1103/PhysRevC.103.014902 . .
 1

#### Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A M
AU  - Tumasyan, A
AU  - Ambrogi, F
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9404
AB  - Measurements of the fiducial inclusive and differential production cross sections of the Higgs boson in proton-proton collisions at s = 13 TeV are performed using events where the Higgs boson decays into a pair of W bosons that subsequently decay into a final state with an electron, a muon, and a pair of neutrinos. The analysis is based on data collected with the CMS detector at the LHC during 2016–2018, corresponding to an integrated luminosity of 137 fb−1. Production cross sections are measured as a function of the transverse momentum of the Higgs boson and the associated jet multiplicity. The Higgs boson signal is extracted and simultaneously unfolded to correct for selection efficiency and resolution effects using maximum-likelihood fits to the observed distributions in data. The integrated fiducial cross section is measured to be 86.5 ± 9.5 fb, consistent with the Standard Model expectation of 82.5 ± 4.2 fb. No significant deviation from the Standard Model expectations is observed in the differential measurements. [Figure not available: see fulltext.] © 2021, The Author(s).
T2  - Journal of High Energy Physics
T1  - Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV
VL  - 2021
IS  - 3
DO  - 10.1007/JHEP03(2021)003
ER  - 
@article{
author = "Sirunyan, A M and Tumasyan, A and Adam, W and Ambrogi, F and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2021",
abstract = "Measurements of the fiducial inclusive and differential production cross sections of the Higgs boson in proton-proton collisions at s = 13 TeV are performed using events where the Higgs boson decays into a pair of W bosons that subsequently decay into a final state with an electron, a muon, and a pair of neutrinos. The analysis is based on data collected with the CMS detector at the LHC during 2016–2018, corresponding to an integrated luminosity of 137 fb−1. Production cross sections are measured as a function of the transverse momentum of the Higgs boson and the associated jet multiplicity. The Higgs boson signal is extracted and simultaneously unfolded to correct for selection efficiency and resolution effects using maximum-likelihood fits to the observed distributions in data. The integrated fiducial cross section is measured to be 86.5 ± 9.5 fb, consistent with the Standard Model expectation of 82.5 ± 4.2 fb. No significant deviation from the Standard Model expectations is observed in the differential measurements. [Figure not available: see fulltext.] © 2021, The Author(s).",
journal = "Journal of High Energy Physics",
title = "Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV",
volume = "2021",
number = "3",
doi = "10.1007/JHEP03(2021)003"
}
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2021). Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV. in Journal of High Energy Physics, 2021(3).
https://doi.org/10.1007/JHEP03(2021)003
Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV. in Journal of High Energy Physics. 2021;2021(3).
doi:10.1007/JHEP03(2021)003 .
Sirunyan, A M, Tumasyan, A, Adam, W, Ambrogi, F, Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at √s = 13 TeV" in Journal of High Energy Physics, 2021, no. 3 (2021),
https://doi.org/10.1007/JHEP03(2021)003 . .
 3 1 6

#### Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9167
AB  - The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1, collected in proton-proton collisions at s=13TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs=−11±50(stat)±10(syst)mrad and ΔΓs=0.114±0.014(stat)±0.007(syst)ps−1, in agreement with the standard model predictions. When combined with the previous CMS measurement at s=8TeV, the following values are obtained: ϕs=−21±44(stat)±10(syst)mrad, ΔΓs=0.1032±0.0095(stat)±0.0048(syst)ps−1, a significant improvement over the 8 TeV result.
T2  - Physics Letters B
T1  - Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV
VL  - 816 C
SP  - 136188
DO  - 10.1016/j.physletb.2021.136188
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1, collected in proton-proton collisions at s=13TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs=−11±50(stat)±10(syst)mrad and ΔΓs=0.114±0.014(stat)±0.007(syst)ps−1, in agreement with the standard model predictions. When combined with the previous CMS measurement at s=8TeV, the following values are obtained: ϕs=−21±44(stat)±10(syst)mrad, ΔΓs=0.1032±0.0095(stat)±0.0048(syst)ps−1, a significant improvement over the 8 TeV result.",
journal = "Physics Letters B",
title = "Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV",
volume = "816 C",
pages = "136188",
doi = "10.1016/j.physletb.2021.136188"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV. in Physics Letters B, 816 C, 136188.
https://doi.org/10.1016/j.physletb.2021.136188
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV. in Physics Letters B. 2021;816 C:136188.
doi:10.1016/j.physletb.2021.136188 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Measurement of the CP-violating phase ϕs in the Bs 0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV" in Physics Letters B, 816 C (2021):136188,
https://doi.org/10.1016/j.physletb.2021.136188 . .
 1 1 2

#### Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV

(2021)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8917
AB  - A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum. The search uses data from proton-proton collisions at s=13TeV collected with the CMS detector, corresponding to an integrated luminosity of 137fb-1. Hypothetical signal events are efficiently separated from the dominant top quark pair production background with requirements on the significance of the missing transverse momentum and on transverse mass variables. No significant deviation is observed from the expected background. Exclusion limits are set in the context of simplified supersymmetric models with pair-produced lightest top squarks. For top squarks decaying exclusively to a top quark and a lightest neutralino, lower limits are placed at 95 % confidence level on the masses of the top squark and the neutralino up to 925 and 450GeV, respectively. If the decay proceeds via an intermediate chargino, the corresponding lower limits on the mass of the lightest top squark are set up to 850GeV for neutralino masses below 420GeV. For top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1.4TeV and 900GeV respectively for the top squark and the lightest neutralino.
T2  - European Physical Journal C
T1  - Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV
VL  - 81
IS  - 1
SP  - 3
DO  - 10.1140/epjc/s10052-020-08701-5
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum. The search uses data from proton-proton collisions at s=13TeV collected with the CMS detector, corresponding to an integrated luminosity of 137fb-1. Hypothetical signal events are efficiently separated from the dominant top quark pair production background with requirements on the significance of the missing transverse momentum and on transverse mass variables. No significant deviation is observed from the expected background. Exclusion limits are set in the context of simplified supersymmetric models with pair-produced lightest top squarks. For top squarks decaying exclusively to a top quark and a lightest neutralino, lower limits are placed at 95 % confidence level on the masses of the top squark and the neutralino up to 925 and 450GeV, respectively. If the decay proceeds via an intermediate chargino, the corresponding lower limits on the mass of the lightest top squark are set up to 850GeV for neutralino masses below 420GeV. For top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1.4TeV and 900GeV respectively for the top squark and the lightest neutralino.",
journal = "European Physical Journal C",
title = "Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV",
volume = "81",
number = "1",
pages = "3",
doi = "10.1140/epjc/s10052-020-08701-5"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV. in European Physical Journal C, 81(1), 3.
https://doi.org/10.1140/epjc/s10052-020-08701-5
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV. in European Physical Journal C. 2021;81(1):3.
doi:10.1140/epjc/s10052-020-08701-5 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for top squark pair production using dilepton final states in pp collision data collected at √s=13TeV" in European Physical Journal C, 81, no. 1 (2021):3,
https://doi.org/10.1140/epjc/s10052-020-08701-5 . .
 1 2 2 4

#### Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9738
AB  - Decays of the 125 GeV Higgs boson into a Z boson and a ρ0(770) or ϕ(1020) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at     s    $$\sqrt{s}$$  = 13 TeV. The analysed data set corresponds to an integrated luminosity of 137 fb −1. Events are selected in which the Z boson decays into a pair of electrons or a pair of muons, and the ρ and ϕ mesons decay into pairs of pions and kaons, respectively. No significant excess above the background model is observed. As different polarization states are possible for the decay products of the Z boson and ρ or ϕ mesons, affecting the signal acceptance, scenarios in which the decays are longitudinally or transversely polarized are considered. Upper limits at the 95% confidence level on the Higgs boson branching fractions into Zρ and Zϕ are determined to be 1.04–1.31% and 0.31–0.40%, respectively, where the ranges reflect the considered polarization scenarios; these values are 740–940 and 730–950 times larger than the respective standard model expectations. These results constitute the first experimental limits on the two decay channels.
T2  - Journal of High Energy Physics
T1  - Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson
VL  - 2020
IS  - 11
SP  - 1
EP  - 42
DO  - 10.1007/JHEP11(2020)039
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "Decays of the 125 GeV Higgs boson into a Z boson and a ρ0(770) or ϕ(1020) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at     s    $$\sqrt{s}$$  = 13 TeV. The analysed data set corresponds to an integrated luminosity of 137 fb −1. Events are selected in which the Z boson decays into a pair of electrons or a pair of muons, and the ρ and ϕ mesons decay into pairs of pions and kaons, respectively. No significant excess above the background model is observed. As different polarization states are possible for the decay products of the Z boson and ρ or ϕ mesons, affecting the signal acceptance, scenarios in which the decays are longitudinally or transversely polarized are considered. Upper limits at the 95% confidence level on the Higgs boson branching fractions into Zρ and Zϕ are determined to be 1.04–1.31% and 0.31–0.40%, respectively, where the ranges reflect the considered polarization scenarios; these values are 740–940 and 730–950 times larger than the respective standard model expectations. These results constitute the first experimental limits on the two decay channels.",
journal = "Journal of High Energy Physics",
title = "Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson",
volume = "2020",
number = "11",
pages = "1-42",
doi = "10.1007/JHEP11(2020)039"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson. in Journal of High Energy Physics, 2020(11), 1-42.
https://doi.org/10.1007/JHEP11(2020)039
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson. in Journal of High Energy Physics. 2020;2020(11):1-42.
doi:10.1007/JHEP11(2020)039 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson" in Journal of High Energy Physics, 2020, no. 11 (2020):1-42,
https://doi.org/10.1007/JHEP11(2020)039 . .
 5 3 4

#### Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9737
AB  - Ratios of cross sections, σ(Z+c  jets)/σ(Z+jets), σ(Z+b  jets)/σ(Z+jets), and σ(Z+c  jets)/σ(Z+b  jets) in the associated production of a Z boson with at least one charm or bottom quark jet are measured in proton-proton collisions at s=13  TeV. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of 35.9  fb−1, with a fiducial volume of pT>30  GeV and |η|<2.4 for the jets, where pT and η represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with pT>25  GeV and |η|<2.4, and the dilepton mass satisfies 71<mZ<111  GeV. The measured values are σ(Z+c  jets)/σ(Z+jets)=0.102±0.002±0.009, σ(Z+b  jets)/σ(Z+jets)=0.0633±0.0004±0.0015, and σ(Z+c  jets)/σ(Z+b  jets)=1.62±0.03±0.15. Results on the inclusive and differential cross section ratios as functions of jet and Z boson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.
T2  - Physical Review D
T1  - Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV
VL  - 102
SP  - 032007
DO  - 10.1103/PhysRevD.102.032007
ER  - 
@article{
author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "Ratios of cross sections, σ(Z+c  jets)/σ(Z+jets), σ(Z+b  jets)/σ(Z+jets), and σ(Z+c  jets)/σ(Z+b  jets) in the associated production of a Z boson with at least one charm or bottom quark jet are measured in proton-proton collisions at s=13  TeV. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of 35.9  fb−1, with a fiducial volume of pT>30  GeV and |η|<2.4 for the jets, where pT and η represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with pT>25  GeV and |η|<2.4, and the dilepton mass satisfies 71<mZ<111  GeV. The measured values are σ(Z+c  jets)/σ(Z+jets)=0.102±0.002±0.009, σ(Z+b  jets)/σ(Z+jets)=0.0633±0.0004±0.0015, and σ(Z+c  jets)/σ(Z+b  jets)=1.62±0.03±0.15. Results on the inclusive and differential cross section ratios as functions of jet and Z boson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.",
journal = "Physical Review D",
title = "Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV",
volume = "102",
pages = "032007",
doi = "10.1103/PhysRevD.102.032007"
}
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV. in Physical Review D, 102, 032007.
https://doi.org/10.1103/PhysRevD.102.032007
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV. in Physical Review D. 2020;102:032007.
doi:10.1103/PhysRevD.102.032007 .
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s =13 TeV" in Physical Review D, 102 (2020):032007,
https://doi.org/10.1103/PhysRevD.102.032007 . .
 1 3 5

#### Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9736
AB  - A search for the production of a narrow-width resonance decaying into a pair of Higgs bosons decaying into the bbZZ channel is presented. The analysis is based on data collected with the CMS detector during 2016, in proton-proton collisions at the LHC, corresponding to an integrated luminosity of 35.9  fb−1. The final states considered are the ones where one of the Z bosons decays into a pair of muons or electrons, and the other Z boson decays to either a pair of quarks or a pair of neutrinos. Upper limits at 95% confidence level are placed on the production of narrow-width spin-0 or spin-2 particles decaying to a pair of Higgs bosons, in models with and without an extended Higgs sector. For a resonance mass range between 260 and 1000 GeV, limits on the production cross section times branching fraction of a spin-0 and spin-2 resonance range from 0.1 to 5.0 pb and 0.1 to 3.6 pb, respectively. These results set limits in parameter space in bulk Randall-Sundrum radion, Kaluza-Klein excitation of the graviton, and next-to-minimal two-Higgs doublet models (N2HDMs). For specific choices of parameters the N2HDM can be excluded in a mass range between 360 and 620 GeV for a resonance decaying to two Higgs bosons. This is the first search for Higgs boson resonant pair production in the bbZZ channel.
T2  - Physical Review D
T1  - Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV
VL  - 102
DO  - 10.1103/PhysRevD.102.032003
ER  - 
@article{
author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "A search for the production of a narrow-width resonance decaying into a pair of Higgs bosons decaying into the bbZZ channel is presented. The analysis is based on data collected with the CMS detector during 2016, in proton-proton collisions at the LHC, corresponding to an integrated luminosity of 35.9  fb−1. The final states considered are the ones where one of the Z bosons decays into a pair of muons or electrons, and the other Z boson decays to either a pair of quarks or a pair of neutrinos. Upper limits at 95% confidence level are placed on the production of narrow-width spin-0 or spin-2 particles decaying to a pair of Higgs bosons, in models with and without an extended Higgs sector. For a resonance mass range between 260 and 1000 GeV, limits on the production cross section times branching fraction of a spin-0 and spin-2 resonance range from 0.1 to 5.0 pb and 0.1 to 3.6 pb, respectively. These results set limits in parameter space in bulk Randall-Sundrum radion, Kaluza-Klein excitation of the graviton, and next-to-minimal two-Higgs doublet models (N2HDMs). For specific choices of parameters the N2HDM can be excluded in a mass range between 360 and 620 GeV for a resonance decaying to two Higgs bosons. This is the first search for Higgs boson resonant pair production in the bbZZ channel.",
journal = "Physical Review D",
title = "Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV",
volume = "102",
doi = "10.1103/PhysRevD.102.032003"
}
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV. in Physical Review D, 102.
https://doi.org/10.1103/PhysRevD.102.032003
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV. in Physical Review D. 2020;102.
doi:10.1103/PhysRevD.102.032003 .
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Search for resonant pair production of Higgs bosons in the bbZZ channel in proton-proton collisions at s =13 TeV" in Physical Review D, 102 (2020),
https://doi.org/10.1103/PhysRevD.102.032003 . .
 1 2 4

#### Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Devetak, Damir
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8841
AB  - A measurement of the production cross section of top quark pairs in association with two b jets (tt‾bb‾) is presented using data collected in proton-proton collisions at s=13 TeV by the CMS detector at the LHC corresponding to an integrated luminosity of 35.9 fb−1. The cross section is measured in the all-jet decay channel of the top quark pair by selecting events containing at least eight jets, of which at least two are identified as originating from the hadronization of b quarks. A combination of multivariate analysis techniques is used to reduce the large background from multijet events not containing a top quark pair, and to help discriminate between jets originating from top quark decays and other additional jets. The cross section is determined for the total phase space to be 5.5±0.3(stat)−1.3+1.6(syst)pb and also measured for two fiducial tt‾bb‾ definitions. The measured cross sections are found to be larger than theoretical predictions by a factor of 1.5–2.4, corresponding to 1–2 standard deviations.
T2  - Physics Letters B
T1  - Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV
VL  - 803 C
SP  - 135285
DO  - 10.1016/j.physletb.2020.135285
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Devetak, Damir and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "A measurement of the production cross section of top quark pairs in association with two b jets (tt‾bb‾) is presented using data collected in proton-proton collisions at s=13 TeV by the CMS detector at the LHC corresponding to an integrated luminosity of 35.9 fb−1. The cross section is measured in the all-jet decay channel of the top quark pair by selecting events containing at least eight jets, of which at least two are identified as originating from the hadronization of b quarks. A combination of multivariate analysis techniques is used to reduce the large background from multijet events not containing a top quark pair, and to help discriminate between jets originating from top quark decays and other additional jets. The cross section is determined for the total phase space to be 5.5±0.3(stat)−1.3+1.6(syst)pb and also measured for two fiducial tt‾bb‾ definitions. The measured cross sections are found to be larger than theoretical predictions by a factor of 1.5–2.4, corresponding to 1–2 standard deviations.",
journal = "Physics Letters B",
title = "Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV",
volume = "803 C",
pages = "135285",
doi = "10.1016/j.physletb.2020.135285"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Devetak, D., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV. in Physics Letters B, 803 C, 135285.
https://doi.org/10.1016/j.physletb.2020.135285
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Devetak D, Đorđević M, Milenović P, Milošević J, Stojanović M. Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV. in Physics Letters B. 2020;803 C:135285.
doi:10.1016/j.physletb.2020.135285 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Devetak, Damir, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Measurement of the tt-bb- production cross section in the all-jet final state in pp collisions at √s=13 TeV" in Physics Letters B, 803 C (2020):135285,
https://doi.org/10.1016/j.physletb.2020.135285 . .
 1 3 1 6

#### Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
AU  - Devetak, Damir
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9095
AB  - Measurements are presented of the reduction of signal output due to radiation damage for two types of plastic scintillator tiles used in the hadron endcap (HE) calorimeter of the CMS detector. The tiles were exposed to particles produced in proton-proton (pp) collisions at the CERN LHC with a center-of-mass energy of 13 TeV, corresponding to a delivered luminosity of 50 fb-1. The measurements are based on readout channels of the HE that were instrumented with silicon photomultipliers, and are derived using data from several sources: A laser calibration system, a movable radioactive source, as well as hadrons and muons produced in pp collisions. Results from several irradiation campaigns using 60Co sources are also discussed. The damage is presented as a function of dose rate. Within the range of these measurements, for a fixed dose the damage increases with decreasing dose rate.
T2  - Journal of Instrumentation
T1  - Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter
DO  - 10.1088/1748-0221/15/06/P06009
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan and Devetak, Damir",
year = "2020",
abstract = "Measurements are presented of the reduction of signal output due to radiation damage for two types of plastic scintillator tiles used in the hadron endcap (HE) calorimeter of the CMS detector. The tiles were exposed to particles produced in proton-proton (pp) collisions at the CERN LHC with a center-of-mass energy of 13 TeV, corresponding to a delivered luminosity of 50 fb-1. The measurements are based on readout channels of the HE that were instrumented with silicon photomultipliers, and are derived using data from several sources: A laser calibration system, a movable radioactive source, as well as hadrons and muons produced in pp collisions. Results from several irradiation campaigns using 60Co sources are also discussed. The damage is presented as a function of dose rate. Within the range of these measurements, for a fixed dose the damage increases with decreasing dose rate.",
journal = "Journal of Instrumentation",
title = "Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter",
doi = "10.1088/1748-0221/15/06/P06009"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J., Stojanović, M.,& Devetak, D.. (2020). Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter. in Journal of Instrumentation.
https://doi.org/10.1088/1748-0221/15/06/P06009
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M, Devetak D. Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter. in Journal of Instrumentation. 2020;.
doi:10.1088/1748-0221/15/06/P06009 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, Devetak, Damir, "Measurements with silicon photomultipliers of dose-rate effects in the radiation damage of plastic scintillator tiles in the CMS hadron endcap calorimeter" in Journal of Instrumentation (2020),
https://doi.org/10.1088/1748-0221/15/06/P06009 . .
 2 1

#### Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9096
AB  - Machine-learning (ML) techniques are explored to identify and classify hadronic decays of highly Lorentz-boosted W/Z/Higgs bosons and top quarks. Techniques without ML have also been evaluated and are included for comparison. The identification performances of a variety of algorithms are characterized in simulated events and directly compared with data. The algorithms are validated using proton-proton collision data at s = 13TeV, corresponding to an integrated luminosity of 35.9 fb-1. Systematic uncertainties are assessed by comparing the results obtained using simulation and collision data. The new techniques studied in this paper provide significant performance improvements over non-ML techniques, reducing the background rate by up to an order of magnitude at the same signal efficiency.
T2  - Journal of Instrumentation
T1  - Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques
DO  - 10.1088/1748-0221/15/06/P06005
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "Machine-learning (ML) techniques are explored to identify and classify hadronic decays of highly Lorentz-boosted W/Z/Higgs bosons and top quarks. Techniques without ML have also been evaluated and are included for comparison. The identification performances of a variety of algorithms are characterized in simulated events and directly compared with data. The algorithms are validated using proton-proton collision data at s = 13TeV, corresponding to an integrated luminosity of 35.9 fb-1. Systematic uncertainties are assessed by comparing the results obtained using simulation and collision data. The new techniques studied in this paper provide significant performance improvements over non-ML techniques, reducing the background rate by up to an order of magnitude at the same signal efficiency.",
journal = "Journal of Instrumentation",
title = "Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques",
doi = "10.1088/1748-0221/15/06/P06005"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques. in Journal of Instrumentation.
https://doi.org/10.1088/1748-0221/15/06/P06005
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques. in Journal of Instrumentation. 2020;.
doi:10.1088/1748-0221/15/06/P06005 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques" in Journal of Instrumentation (2020),
https://doi.org/10.1088/1748-0221/15/06/P06005 . .
 8 18 20

#### Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9538
AB  - The first measurements of production cross sections of polarized same-sign W±W± boson pairs in proton-proton collisions are reported. The measurements are based on a data sample collected with the CMS detector at the LHC at a center-of-mass energy of 13TeV, corresponding to an integrated luminosity of 137fb−1. Events are selected by requiring exactly two same-sign leptons, electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass to enhance the contribution of same-sign W±W± scattering events. An observed (expected) 95% confidence level upper limit of 1.17 (0.88) fbis set on the production cross section for longitudinally polarized same-sign W±W± boson pairs. The electroweak production of same-sign W±W± boson pairs with at least one of the W bosons longitudinally polarized is measured with an observed (expected) significance of 2.3 (3.1) standard deviations.
T2  - Physics Letters B
T1  - Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV
VL  - 962 C
DO  - 10.1016/j.physletb.2020.136018
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2020",
abstract = "The first measurements of production cross sections of polarized same-sign W±W± boson pairs in proton-proton collisions are reported. The measurements are based on a data sample collected with the CMS detector at the LHC at a center-of-mass energy of 13TeV, corresponding to an integrated luminosity of 137fb−1. Events are selected by requiring exactly two same-sign leptons, electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass to enhance the contribution of same-sign W±W± scattering events. An observed (expected) 95% confidence level upper limit of 1.17 (0.88) fbis set on the production cross section for longitudinally polarized same-sign W±W± boson pairs. The electroweak production of same-sign W±W± boson pairs with at least one of the W bosons longitudinally polarized is measured with an observed (expected) significance of 2.3 (3.1) standard deviations.",
journal = "Physics Letters B",
title = "Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV",
volume = "962 C",
doi = "10.1016/j.physletb.2020.136018"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2020). Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV. in Physics Letters B, 962 C.
https://doi.org/10.1016/j.physletb.2020.136018
Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV. in Physics Letters B. 2020;962 C.
doi:10.1016/j.physletb.2020.136018 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at s=13 TeV" in Physics Letters B, 962 C (2020),
https://doi.org/10.1016/j.physletb.2020.136018 . .
 1 3 3 5

#### Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A.M.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9574
AB  - Evidence is presented for the electroweak (EW) production of two jets (jj) in association with two Z bosons and constraints on anomalous quartic gauge couplings are set. The analysis is based on a data sample of proton-proton collisions at s=13TeV collected with the CMS detector in 2016–2018, and corresponding to an integrated luminosity of 137fb−1. The search is performed in the fully leptonic final state ZZ→ℓℓℓ′ℓ′, where ℓ,ℓ′=e,μ. The EW production of two jets in association with two Z bosons is measured with an observed (expected) significance of 4.0 (3.5) standard deviations. The cross sections for the EW production are measured in three fiducial volumes and the result is σEW(pp→ZZjj→ℓℓℓ′ℓ′jj)=0.33−0.10+0.11(stat)−0.03+0.04(syst)fb in the most inclusive volume, in agreement with the standard model prediction of 0.275±0.021fb. Measurements of total cross sections for jj production in association with two Z bosons are also reported. Limits on anomalous quartic gauge couplings are derived in terms of the effective field theory operators T0, T1, T2, T8, and T9.
T2  - Physics Letters B
T1  - Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV
VL  - 962 C
DO  - 10.1016/j.physletb.2020.135992
ER  - 
@article{
author = "Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2020",
abstract = "Evidence is presented for the electroweak (EW) production of two jets (jj) in association with two Z bosons and constraints on anomalous quartic gauge couplings are set. The analysis is based on a data sample of proton-proton collisions at s=13TeV collected with the CMS detector in 2016–2018, and corresponding to an integrated luminosity of 137fb−1. The search is performed in the fully leptonic final state ZZ→ℓℓℓ′ℓ′, where ℓ,ℓ′=e,μ. The EW production of two jets in association with two Z bosons is measured with an observed (expected) significance of 4.0 (3.5) standard deviations. The cross sections for the EW production are measured in three fiducial volumes and the result is σEW(pp→ZZjj→ℓℓℓ′ℓ′jj)=0.33−0.10+0.11(stat)−0.03+0.04(syst)fb in the most inclusive volume, in agreement with the standard model prediction of 0.275±0.021fb. Measurements of total cross sections for jj production in association with two Z bosons are also reported. Limits on anomalous quartic gauge couplings are derived in terms of the effective field theory operators T0, T1, T2, T8, and T9.",
journal = "Physics Letters B",
title = "Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV",
volume = "962 C",
doi = "10.1016/j.physletb.2020.135992"
}
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2020). Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV. in Physics Letters B, 962 C.
https://doi.org/10.1016/j.physletb.2020.135992
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV. in Physics Letters B. 2020;962 C.
doi:10.1016/j.physletb.2020.135992 .
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s=13TeV" in Physics Letters B, 962 C (2020),
https://doi.org/10.1016/j.physletb.2020.135992 . .
 1 3 2 3

#### Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
AU  - Stojanović, Milan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9612
AB  - A data sample of events from proton-proton collisions with at least two jets, and two isolated same-sign or three or more charged leptons, is studied in a search for signatures of new physics phenomena. The data correspond to an integrated luminosity of $$137{\,{\text {fb}}^{-1}}$$ 137fb-1  at a center-of-mass energy of $$13\,{\text {TeV}}$$ 13TeV , collected in 2016–2018 by the CMS experiment at the LHC. The search is performed using a total of 168 signal regions defined using several kinematic variables. The properties of the events are found to be consistent with the expectations from standard model processes. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos or squarks for various decay scenarios in the context of supersymmetric models conserving or violating R parity. The observed lower mass limits are as large as $$2.1\,{\text {TeV}}$$ 2.1TeV  for gluinos and $$0.9\,{\text {TeV}}$$ 0.9TeV  for top and bottom squarks. To facilitate reinterpretations, model-independent limits are provided in a set of simplified signal regions.
T2  - European Physical Journal C
T1  - Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV
VL  - 80
IS  - 8
SP  - 752
DO  - 10.1140/epjc/s10052-020-8168-3
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan",
year = "2020",
abstract = "A data sample of events from proton-proton collisions with at least two jets, and two isolated same-sign or three or more charged leptons, is studied in a search for signatures of new physics phenomena. The data correspond to an integrated luminosity of $$137{\,{\text {fb}}^{-1}}$$ 137fb-1  at a center-of-mass energy of $$13\,{\text {TeV}}$$ 13TeV , collected in 2016–2018 by the CMS experiment at the LHC. The search is performed using a total of 168 signal regions defined using several kinematic variables. The properties of the events are found to be consistent with the expectations from standard model processes. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos or squarks for various decay scenarios in the context of supersymmetric models conserving or violating R parity. The observed lower mass limits are as large as $$2.1\,{\text {TeV}}$$ 2.1TeV  for gluinos and $$0.9\,{\text {TeV}}$$ 0.9TeV  for top and bottom squarks. To facilitate reinterpretations, model-independent limits are provided in a set of simplified signal regions.",
journal = "European Physical Journal C",
title = "Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV",
volume = "80",
number = "8",
pages = "752",
doi = "10.1140/epjc/s10052-020-8168-3"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV. in European Physical Journal C, 80(8), 752.
https://doi.org/10.1140/epjc/s10052-020-8168-3
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV. in European Physical Journal C. 2020;80(8):752.
doi:10.1140/epjc/s10052-020-8168-3 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s√=13TeV" in European Physical Journal C, 80, no. 8 (2020):752,
https://doi.org/10.1140/epjc/s10052-020-8168-3 . .
 2 4 6 7

#### Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Asilar, E.
AU  - Okhotnikov, V.
AU  - Ćirković, Predrag
AU  - Devetak, Damir
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9647
AB  - Normalised multi-differential cross sections for top quark pair (t t ¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9fb-1. The double-differential t t ¯ cross section is measured as a function of the kinematic properties of the top quark and of the t t ¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t t ¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mtpole) using several sets of parton distribution functions (PDFs). The measurement of mtpole exploits the sensitivity of the t t ¯ invariant mass distribution to mtpole near the production threshold. Furthermore, a simultaneous fit of the PDFs, αS, and mtpole is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mtpole. The values αS(mZ)=0.1135-0.0017+0.0021 and mtpole=170.5±0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t t ¯ production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of mtpole of the order of +1GeV, which can be regarded as additional theoretical uncertainty in the current mtpole extraction.
T2  - European Physical Journal C
T1  - Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions
VL  - 80
IS  - 7
SP  - 658
DO  - 10.1140/epjc/s10052-020-7917-7
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Okhotnikov, V. and Adžić, Petar and Ćirković, Predrag and Devetak, Damir and Đorđević, Miloš and Milenović, Predrag",
year = "2020",
abstract = "Normalised multi-differential cross sections for top quark pair (t t ¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9fb-1. The double-differential t t ¯ cross section is measured as a function of the kinematic properties of the top quark and of the t t ¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t t ¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mtpole) using several sets of parton distribution functions (PDFs). The measurement of mtpole exploits the sensitivity of the t t ¯ invariant mass distribution to mtpole near the production threshold. Furthermore, a simultaneous fit of the PDFs, αS, and mtpole is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mtpole. The values αS(mZ)=0.1135-0.0017+0.0021 and mtpole=170.5±0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t t ¯ production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of mtpole of the order of +1GeV, which can be regarded as additional theoretical uncertainty in the current mtpole extraction.",
journal = "European Physical Journal C",
title = "Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions",
volume = "80",
number = "7",
pages = "658",
doi = "10.1140/epjc/s10052-020-7917-7"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Okhotnikov, V., Adžić, P., Ćirković, P., Devetak, D., Đorđević, M.,& Milenović, P.. (2020). Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions. in European Physical Journal C, 80(7), 658.
https://doi.org/10.1140/epjc/s10052-020-7917-7
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Asilar E, Okhotnikov V, Adžić P, Ćirković P, Devetak D, Đorđević M, Milenović P. Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions. in European Physical Journal C. 2020;80(7):658.
doi:10.1140/epjc/s10052-020-7917-7 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Okhotnikov, V., Adžić, Petar, Ćirković, Predrag, Devetak, Damir, Đorđević, Miloš, Milenović, Predrag, "Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions" in European Physical Journal C, 80, no. 7 (2020):658,
https://doi.org/10.1140/epjc/s10052-020-7917-7 . .
 9 14

#### Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum

(2020)

TY  - JOUR
AU  - Sirunyan, A.
AU  - Tumasyan, A.
AU  - Ambrogi, F.
AU  - Bergauer, T.
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9648
AB  - A search for new physics in events with two highly Lorentz-boosted Z bosons and large missing transverse momentum is presented. The analyzed proton-proton collision data, corresponding to an integrated luminosity of 137 fb−1, were recorded at s = 13 TeV by the CMS experiment at the CERN LHC. The search utilizes the substructure of jets with large radius to identify quark pairs from Z boson decays. Backgrounds from standard model processes are suppressed by requirements on the jet mass and the missing transverse momentum. No significant excess in the event yield is observed beyond the number of background events expected from the standard model. For a simplified supersymmetric model in which the Z bosons arise from the decay of gluinos, an exclusion limit of 1920 GeV on the gluino mass is set at 95% confidence level. This is the first search for beyond-standard-model production of pairs of boosted Z bosons plus large missing transverse momentum.
T2  - Journal of High Energy Physics
T1  - Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum
VL  - 2020
IS  - 9
SP  - 149
DO  - 10.1007/JHEP09(2020)149
ER  - 
@article{
author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2020",
abstract = "A search for new physics in events with two highly Lorentz-boosted Z bosons and large missing transverse momentum is presented. The analyzed proton-proton collision data, corresponding to an integrated luminosity of 137 fb−1, were recorded at s = 13 TeV by the CMS experiment at the CERN LHC. The search utilizes the substructure of jets with large radius to identify quark pairs from Z boson decays. Backgrounds from standard model processes are suppressed by requirements on the jet mass and the missing transverse momentum. No significant excess in the event yield is observed beyond the number of background events expected from the standard model. For a simplified supersymmetric model in which the Z bosons arise from the decay of gluinos, an exclusion limit of 1920 GeV on the gluino mass is set at 95% confidence level. This is the first search for beyond-standard-model production of pairs of boosted Z bosons plus large missing transverse momentum.",
journal = "Journal of High Energy Physics",
title = "Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum",
volume = "2020",
number = "9",
pages = "149",
doi = "10.1007/JHEP09(2020)149"
}
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2020). Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum. in Journal of High Energy Physics, 2020(9), 149.
https://doi.org/10.1007/JHEP09(2020)149
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum. in Journal of High Energy Physics. 2020;2020(9):149.
doi:10.1007/JHEP09(2020)149 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum" in Journal of High Energy Physics, 2020, no. 9 (2020):149,
https://doi.org/10.1007/JHEP09(2020)149 . .
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