TY  - JOUR
AU  - Aaboud, M.
AU  - Aad, G.
AU  - Abbott, B.
AU  - Agatonović-Jovin, Tatjana
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Sijacki, Dj.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11846
AB  - A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.
T2  - European Physical Journal C
T1  - Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector
VL  - 78
IS  - 1
SP  - 18
DO  - 10.1140/epjc/s10052-017-5486-1
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Dimitrievska, A. and Krstic, J. and Sijacki, Dj. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2018",
abstract = "A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.",
journal = "European Physical Journal C",
title = "Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector",
volume = "78",
number = "1",
pages = "18",
doi = "10.1140/epjc/s10052-017-5486-1"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Dimitrievska, A., Krstic, J., Sijacki, Dj., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2018). Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector. in European Physical Journal C, 78(1), 18.
https://doi.org/10.1140/epjc/s10052-017-5486-1

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Dimitrievska A, Krstic J, Sijacki D, Vranjes N, Vranjes Milosavljevic M, Živković L. Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector. in European Physical Journal C. 2018;78(1):18.
doi:10.1140/epjc/s10052-017-5486-1 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Dimitrievska, A., Krstic, J., Sijacki, Dj., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector" in European Physical Journal C, 78, no. 1 (2018):18,
https://doi.org/10.1140/epjc/s10052-017-5486-1 . .

TY  - JOUR
AU  - Aaboud, M.
AU  - Aad, G.
AU  - Abbott, B.
AU  - Agatonović-Jovin, Tatjana
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Sijacki, Dj.
AU  - Simic, L.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11829
AB  - The results of a search for the direct pair production of top squarks, the supersymmetric partner of the top quark, in final states with one isolated electron or muon, several energetic jets, and missing transverse momentum are reported. The analysis also targets spin-0 mediator models, where the mediator decays into a pair of dark-matter particles and is produced in association with a pair of top quarks. The search uses data from proton-proton collisions delivered by the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of  s=13 $$ \sqrt{s}=13 $$ TeV and recorded by the ATLAS detector, corresponding to an integrated luminosity of 36 fb−1. A wide range of signal scenarios with different mass-splittings between the top squark, the lightest neutralino and possible intermediate supersymmetric particles are considered, including cases where the W bosons or the top quarks produced in the decay chain are off-shell. No significant excess over the Standard Model prediction is observed. The null results are used to set exclusion limits at 95% confidence level in several supersymmetry benchmark models. For pair-produced top-squarks decaying into top quarks, top-squark masses up to 940 GeV are excluded. Stringent exclusion limits are also derived for all other considered top-squark decay scenarios. For the spin-0 mediator models, upper limits are set on the visible cross-section.
T2  - Journal of High Energy Physics
T1  - Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector
DO  - 10.1007/JHEP06(2018)108
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Dimitrievska, A. and Krstic, J. and Sijacki, Dj. and Simic, L. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2018",
abstract = "The results of a search for the direct pair production of top squarks, the supersymmetric partner of the top quark, in final states with one isolated electron or muon, several energetic jets, and missing transverse momentum are reported. The analysis also targets spin-0 mediator models, where the mediator decays into a pair of dark-matter particles and is produced in association with a pair of top quarks. The search uses data from proton-proton collisions delivered by the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of  s=13 $$ \sqrt{s}=13 $$ TeV and recorded by the ATLAS detector, corresponding to an integrated luminosity of 36 fb−1. A wide range of signal scenarios with different mass-splittings between the top squark, the lightest neutralino and possible intermediate supersymmetric particles are considered, including cases where the W bosons or the top quarks produced in the decay chain are off-shell. No significant excess over the Standard Model prediction is observed. The null results are used to set exclusion limits at 95% confidence level in several supersymmetry benchmark models. For pair-produced top-squarks decaying into top quarks, top-squark masses up to 940 GeV are excluded. Stringent exclusion limits are also derived for all other considered top-squark decay scenarios. For the spin-0 mediator models, upper limits are set on the visible cross-section.",
journal = "Journal of High Energy Physics",
title = "Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector",
doi = "10.1007/JHEP06(2018)108"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, L., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2018). Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector. in Journal of High Energy Physics.
https://doi.org/10.1007/JHEP06(2018)108

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Dimitrievska A, Krstic J, Sijacki D, Simic L, Vranjes N, Vranjes Milosavljevic M, Živković L. Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector. in Journal of High Energy Physics. 2018;.
doi:10.1007/JHEP06(2018)108 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, L., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector" in Journal of High Energy Physics (2018),
https://doi.org/10.1007/JHEP06(2018)108 . .

TY  - JOUR
AU  - Aaboud, M.
AU  - Aad, G.
AU  - Abbott, B.
AU  - Agatonović-Jovin, Tatjana
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Sijacki, Dj.
AU  - Simic, L.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11827
AB  - A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks into the lightest neutralino  χ˜10 $$ \left({\tilde{\chi}}_1^0\right) $$ is reported. It uses LHC proton-proton collision data at a centre-of-mass energy  s=13 $$ \sqrt{s}=13 $$ TeV with an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from b-quarks. To increase the sensitivity, the sample is divided into subsamples based on the presence or absence of electrons or muons. No excess is found above the predicted background. For  χ˜10 $$ {\tilde{\chi}}_1^0 $$ masses below approximately 300 GeV, gluino masses of less than 1.97 (1.92) TeV are excluded at 95% confidence level in simplified models involving the pair production of gluinos that decay via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos into third-generation squarks is also provided. These results improve upon the exclusion limits obtained with the 3.2 fb−1 of data collected in 2015.
T2  - Journal of High Energy Physics
T1  - Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector
VL  - 2018
IS  - 6
SP  - 107
DO  - 10.1007/JHEP06(2018)107
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Dimitrievska, A. and Krstic, J. and Sijacki, Dj. and Simic, L. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2018",
abstract = "A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks into the lightest neutralino  χ˜10 $$ \left({\tilde{\chi}}_1^0\right) $$ is reported. It uses LHC proton-proton collision data at a centre-of-mass energy  s=13 $$ \sqrt{s}=13 $$ TeV with an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from b-quarks. To increase the sensitivity, the sample is divided into subsamples based on the presence or absence of electrons or muons. No excess is found above the predicted background. For  χ˜10 $$ {\tilde{\chi}}_1^0 $$ masses below approximately 300 GeV, gluino masses of less than 1.97 (1.92) TeV are excluded at 95% confidence level in simplified models involving the pair production of gluinos that decay via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos into third-generation squarks is also provided. These results improve upon the exclusion limits obtained with the 3.2 fb−1 of data collected in 2015.",
journal = "Journal of High Energy Physics",
title = "Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector",
volume = "2018",
number = "6",
pages = "107",
doi = "10.1007/JHEP06(2018)107"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, L., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2018). Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector. in Journal of High Energy Physics, 2018(6), 107.
https://doi.org/10.1007/JHEP06(2018)107

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Dimitrievska A, Krstic J, Sijacki D, Simic L, Vranjes N, Vranjes Milosavljevic M, Živković L. Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector. in Journal of High Energy Physics. 2018;2018(6):107.
doi:10.1007/JHEP06(2018)107 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, L., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector" in Journal of High Energy Physics, 2018, no. 6 (2018):107,
https://doi.org/10.1007/JHEP06(2018)107 . .

TY  - JOUR
AU  - Aaboud, M.
AU  - Aad, G.
AU  - Abbott, B.
AU  - Agatonović-Jovin, Tatjana
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Sijacki, Dj.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11825
AB  - A search is performed for new phenomena in events having a photon with high transverse momentum and a jet collected in 36.7fb-1 of proton–proton collisions at a centre-of-mass energy of s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The invariant mass distribution of the leading photon and jet is examined to look for the resonant production of new particles or the presence of new high-mass states beyond the Standard Model. No significant deviation from the background-only hypothesis is observed and cross-section limits for generic Gaussian-shaped resonances are extracted. Excited quarks hypothesized in quark compositeness models and high-mass states predicted in quantum black hole models with extra dimensions are also examined in the analysis. The observed data exclude, at 95% confidence level, the mass range below 5.3 TeV for excited quarks and 7.1 TeV (4.4 TeV) for quantum black holes in the Arkani-Hamed–Dimopoulos–Dvali (Randall–Sundrum) model with six (one) extra dimensions.
T2  - European Physical Journal C
T1  - Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at √s = 13 TeV with the ATLAS detector
VL  - 78
IS  - 2
SP  - 102
DO  - 10.1140/epjc/s10052-018-5553-2
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Dimitrievska, A. and Krstic, J. and Sijacki, Dj. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2018",
abstract = "A search is performed for new phenomena in events having a photon with high transverse momentum and a jet collected in 36.7fb-1 of proton–proton collisions at a centre-of-mass energy of s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The invariant mass distribution of the leading photon and jet is examined to look for the resonant production of new particles or the presence of new high-mass states beyond the Standard Model. No significant deviation from the background-only hypothesis is observed and cross-section limits for generic Gaussian-shaped resonances are extracted. Excited quarks hypothesized in quark compositeness models and high-mass states predicted in quantum black hole models with extra dimensions are also examined in the analysis. The observed data exclude, at 95% confidence level, the mass range below 5.3 TeV for excited quarks and 7.1 TeV (4.4 TeV) for quantum black holes in the Arkani-Hamed–Dimopoulos–Dvali (Randall–Sundrum) model with six (one) extra dimensions.",
journal = "European Physical Journal C",
title = "Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at √s = 13 TeV with the ATLAS detector",
volume = "78",
number = "2",
pages = "102",
doi = "10.1140/epjc/s10052-018-5553-2"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Dimitrievska, A., Krstic, J., Sijacki, Dj., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2018). Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at √s = 13 TeV with the ATLAS detector. in European Physical Journal C, 78(2), 102.
https://doi.org/10.1140/epjc/s10052-018-5553-2

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Dimitrievska A, Krstic J, Sijacki D, Vranjes N, Vranjes Milosavljevic M, Živković L. Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at √s = 13 TeV with the ATLAS detector. in European Physical Journal C. 2018;78(2):102.
doi:10.1140/epjc/s10052-018-5553-2 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Dimitrievska, A., Krstic, J., Sijacki, Dj., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at √s = 13 TeV with the ATLAS detector" in European Physical Journal C, 78, no. 2 (2018):102,
https://doi.org/10.1140/epjc/s10052-018-5553-2 . .

TY  - JOUR
AU  - Aaboud, M.
AU  - Aad, G.
AU  - Abbott, B.
AU  - Agatonović-Jovin, Tatjana
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Sijacki, Dj.
AU  - Simic, Lj.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11847
AB  - Observables sensitive to the anomalous production of events containing hadronic jets and missing momentum in the plane transverse to the proton beams at the Large Hadron Collider are presented. The observables are defined as a ratio of cross sections, for events containing jets and large missing transverse momentum to events containing jets and a pair of charged leptons from the decay of a Z/ γ∗boson. This definition minimises experimental and theoretical systematic uncertainties in the measurements. This ratio is measured differentially with respect to a number of kinematic properties of the hadronic system in two phase-space regions; one inclusive single-jet region and one region sensitive to vector-boson-fusion topologies. The data are found to be in agreement with the Standard Model predictions and used to constrain a variety of theoretical models for dark-matter production, including simplified models, effective field theory models, and invisible decays of the Higgs boson. The measurements use 3.2 fb- 1of proton–proton collision data recorded by the ATLAS experiment at a centre-of-mass energy of 13 TeV and are fully corrected for detector effects, meaning that the data can be used to constrain new-physics models beyond those shown in this paper.
T2  - European Physical Journal C
T1  - Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pp collisions at √s=13 TeV using the ATLAS detector
VL  - 77
IS  - 11
SP  - 765
DO  - 10.1140/epjc/s10052-017-5315-6
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Dimitrievska, A. and Krstic, J. and Sijacki, Dj. and Simic, Lj. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2017",
abstract = "Observables sensitive to the anomalous production of events containing hadronic jets and missing momentum in the plane transverse to the proton beams at the Large Hadron Collider are presented. The observables are defined as a ratio of cross sections, for events containing jets and large missing transverse momentum to events containing jets and a pair of charged leptons from the decay of a Z/ γ∗boson. This definition minimises experimental and theoretical systematic uncertainties in the measurements. This ratio is measured differentially with respect to a number of kinematic properties of the hadronic system in two phase-space regions; one inclusive single-jet region and one region sensitive to vector-boson-fusion topologies. The data are found to be in agreement with the Standard Model predictions and used to constrain a variety of theoretical models for dark-matter production, including simplified models, effective field theory models, and invisible decays of the Higgs boson. The measurements use 3.2 fb- 1of proton–proton collision data recorded by the ATLAS experiment at a centre-of-mass energy of 13 TeV and are fully corrected for detector effects, meaning that the data can be used to constrain new-physics models beyond those shown in this paper.",
journal = "European Physical Journal C",
title = "Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pp collisions at √s=13 TeV using the ATLAS detector",
volume = "77",
number = "11",
pages = "765",
doi = "10.1140/epjc/s10052-017-5315-6"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2017). Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pp collisions at √s=13 TeV using the ATLAS detector. in European Physical Journal C, 77(11), 765.
https://doi.org/10.1140/epjc/s10052-017-5315-6

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Dimitrievska A, Krstic J, Sijacki D, Simic L, Vranjes N, Vranjes Milosavljevic M, Živković L. Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pp collisions at √s=13 TeV using the ATLAS detector. in European Physical Journal C. 2017;77(11):765.
doi:10.1140/epjc/s10052-017-5315-6 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Dimitrievska, A., Krstic, J., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pp collisions at √s=13 TeV using the ATLAS detector" in European Physical Journal C, 77, no. 11 (2017):765,
https://doi.org/10.1140/epjc/s10052-017-5315-6 . .