TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Adam, W.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10007
AB  - The first measurement of the inclusive cross section for top quark pairs (tt‾) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of tt‾ events produced in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 41.5fb−1, recorded by the CMS experiment at the LHC. A new charm jet identification algorithm provides input to a neural network that is trained to distinguish among tt‾ events with two additional charm (tt‾cc‾), bottom (tt‾bb‾), and light-flavour or gluon (tt‾LL) jets. By means of a template fitting procedure, the inclusive tt‾cc‾, tt‾bb‾, and tt‾LL cross sections are simultaneously measured, together with their ratios to the inclusive tt‾ + two jets cross section. This provides measurements of the tt‾cc‾ and tt‾bb‾ cross sections of 10.1±1.2(stat)±1.4(syst)pb and 4.54±0.35(stat)±0.56(syst)pb, respectively, in the full phase space. The results are compared and found to be consistent with predictions from two different matrix element generators with next-to-leading order accuracy in quantum chromodynamics, interfaced with a parton shower simulation.
T2  - Physics Letters B
T1  - First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV
VL  - 820 C
SP  - 136565
DO  - 10.1016/j.physletb.2021.136565
ER  - 

@article{
author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "The first measurement of the inclusive cross section for top quark pairs (tt‾) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of tt‾ events produced in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 41.5fb−1, recorded by the CMS experiment at the LHC. A new charm jet identification algorithm provides input to a neural network that is trained to distinguish among tt‾ events with two additional charm (tt‾cc‾), bottom (tt‾bb‾), and light-flavour or gluon (tt‾LL) jets. By means of a template fitting procedure, the inclusive tt‾cc‾, tt‾bb‾, and tt‾LL cross sections are simultaneously measured, together with their ratios to the inclusive tt‾ + two jets cross section. This provides measurements of the tt‾cc‾ and tt‾bb‾ cross sections of 10.1±1.2(stat)±1.4(syst)pb and 4.54±0.35(stat)±0.56(syst)pb, respectively, in the full phase space. The results are compared and found to be consistent with predictions from two different matrix element generators with next-to-leading order accuracy in quantum chromodynamics, interfaced with a parton shower simulation.",
journal = "Physics Letters B",
title = "First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV",
volume = "820 C",
pages = "136565",
doi = "10.1016/j.physletb.2021.136565"
}

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV. in Physics Letters B, 820 C, 136565.
https://doi.org/10.1016/j.physletb.2021.136565

Sirunyan AM, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Đorđević M, Milenović P, Milošević J. First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV. in Physics Letters B. 2021;820 C:136565.
doi:10.1016/j.physletb.2021.136565 .

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s=13TeV" in Physics Letters B, 820 C (2021):136565,
https://doi.org/10.1016/j.physletb.2021.136565 . .

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Adam, W.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Adžić, Petar
AU  - Ćirković, Predrag
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10004
AB  - A search for leptoquarks produced singly and in pairs in proton-proton collisions is presented. We consider the leptoquark (LQ) to be a scalar particle of charge −1/3e coupling to a top quark plus a tau lepton (tτ) or a bottom quark plus a neutrino (bν), or a vector particle of charge +2/3e, coupling to tν or bτ. These choices are motivated by models that can explain a series of anomalies observed in the measurement of B meson decays. In this analysis the signatures tτνb and tτν are probed, using data recorded by the CMS experiment at the CERN LHC at s=13 TeV and that correspond to an integrated luminosity of 137 fb$^{−1}$. These signatures have not been previously explored in a dedicated search. The data are found to be in agreement with the standard model prediction. Lower limits at 95% confidence level are set on the LQ mass in the range 0.98–1.73 TeV, depending on the LQ spin and its coupling λ to a lepton and a quark, and assuming equal couplings for the two LQ decay modes considered. These are the most stringent constraints to date on the existence of leptoquarks in this scenario.
T2  - Physics Letters B
T1  - Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s=13 TeV
VL  - 819 C
SP  - 136446
DO  - 10.1016/j.physletb.2021.136446
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 = "2021",
abstract = "A search for leptoquarks produced singly and in pairs in proton-proton collisions is presented. We consider the leptoquark (LQ) to be a scalar particle of charge −1/3e coupling to a top quark plus a tau lepton (tτ) or a bottom quark plus a neutrino (bν), or a vector particle of charge +2/3e, coupling to tν or bτ. These choices are motivated by models that can explain a series of anomalies observed in the measurement of B meson decays. In this analysis the signatures tτνb and tτν are probed, using data recorded by the CMS experiment at the CERN LHC at s=13 TeV and that correspond to an integrated luminosity of 137 fb$^{−1}$. These signatures have not been previously explored in a dedicated search. The data are found to be in agreement with the standard model prediction. Lower limits at 95% confidence level are set on the LQ mass in the range 0.98–1.73 TeV, depending on the LQ spin and its coupling λ to a lepton and a quark, and assuming equal couplings for the two LQ decay modes considered. These are the most stringent constraints to date on the existence of leptoquarks in this scenario.",
journal = "Physics Letters B",
title = "Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s=13 TeV",
volume = "819 C",
pages = "136446",
doi = "10.1016/j.physletb.2021.136446"
}

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s=13 TeV. in Physics Letters B, 819 C, 136446.
https://doi.org/10.1016/j.physletb.2021.136446

Sirunyan AM, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J. Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s=13 TeV. in Physics Letters B. 2021;819 C:136446.
doi:10.1016/j.physletb.2021.136446 .

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s=13 TeV" in Physics Letters B, 819 C (2021):136446,
https://doi.org/10.1016/j.physletb.2021.136446 . .

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Adam, W.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Adžić, Petar
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. Particles and Fields
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. 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 = "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. Particles and Fields",
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. M., 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. Particles and Fields, 81(4), 333.
https://doi.org/10.1140/epjc/s10052-021-08959-3

Sirunyan AM, 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. Particles and Fields. 2021;81(4):333.
doi:10.1140/epjc/s10052-021-08959-3 .

Sirunyan, A. M., 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. Particles and Fields, 81, no. 4 (2021):333,
https://doi.org/10.1140/epjc/s10052-021-08959-3 . .

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Adam, W.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Adžić, Petar
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. 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 = "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. M., 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 AM, 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. M., 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 . .

TY  - JOUR
AU  - Sirunyan, A. M.
AU  - Tumasyan, A.
AU  - Adam, W.
AU  - Bergauer, T.
AU  - Dragicevic, M.
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Milenović, Predrag
AU  - Milošević, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9652
AB  - A search for phenomena beyond the standard model in final states with two oppositely charged same-flavor leptons and missing transverse momentum is presented. The search uses a data sample of proton-proton collisions at s = 13 TeV, corresponding to an integrated luminosity of 137 fb−1, collected by the CMS experiment at the LHC. Three potential signatures of physics beyond the standard model are explored: an excess of events with a lepton pair, whose invariant mass is consistent with the Z boson mass; a kinematic edge in the invariant mass distribution of the lepton pair; and the nonresonant production of two leptons. The observed event yields are consistent with those expected from standard model backgrounds. The results of the first search allow the exclusion of gluino masses up to 1870 GeV, as well as chargino (neutralino) masses up to 750 (800) GeV, while those of the searches for the other two signatures allow the exclusion of light-flavor (bottom) squark masses up to 1800 (1600) GeV and slepton masses up to 700 GeV, respectively, at 95% confidence level within certain supersymmetry scenarios.
T2  - Journal of High Energy Physics
T1  - Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at √s = 13 TeV
VL  - 2021
IS  - 4
SP  - 123
DO  - 10.1007/JHEP04(2021)123
ER  - 

@article{
author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Adžić, Petar and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan",
year = "2021",
abstract = "A search for phenomena beyond the standard model in final states with two oppositely charged same-flavor leptons and missing transverse momentum is presented. The search uses a data sample of proton-proton collisions at s = 13 TeV, corresponding to an integrated luminosity of 137 fb−1, collected by the CMS experiment at the LHC. Three potential signatures of physics beyond the standard model are explored: an excess of events with a lepton pair, whose invariant mass is consistent with the Z boson mass; a kinematic edge in the invariant mass distribution of the lepton pair; and the nonresonant production of two leptons. The observed event yields are consistent with those expected from standard model backgrounds. The results of the first search allow the exclusion of gluino masses up to 1870 GeV, as well as chargino (neutralino) masses up to 750 (800) GeV, while those of the searches for the other two signatures allow the exclusion of light-flavor (bottom) squark masses up to 1800 (1600) GeV and slepton masses up to 700 GeV, respectively, at 95% confidence level within certain supersymmetry scenarios.",
journal = "Journal of High Energy Physics",
title = "Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at √s = 13 TeV",
volume = "2021",
number = "4",
pages = "123",
doi = "10.1007/JHEP04(2021)123"
}

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, P., Đorđević, M., Milenović, P.,& Milošević, J.. (2021). Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics, 2021(4), 123.
https://doi.org/10.1007/JHEP04(2021)123

Sirunyan AM, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Adžić P, Đorđević M, Milenović P, Milošević J. Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at √s = 13 TeV. in Journal of High Energy Physics. 2021;2021(4):123.
doi:10.1007/JHEP04(2021)123 .

Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Adžić, Petar, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, "Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at √s = 13 TeV" in Journal of High Energy Physics, 2021, no. 4 (2021):123,
https://doi.org/10.1007/JHEP04(2021)123 . .