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  - Bogavac, D.
AU  - Bokan, P.
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Marjanovic, M.
AU  - Popovic, D.
AU  - Sijacki, Dj.
AU  - Simic, Lj.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11834
AB  - Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the Large Hadron Collider are reported. The data were collected in proton-proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 3.2 fb−1. The observed data are in agreement with the Standard Model expectations. Exclusion limits are presented in models of new phenomena including pair production of dark matter candidates or large extra spatial dimensions. In a simplified model of dark matter and an axial-vector mediator, the search excludes mediator masses below 710 GeV for dark matter candidate masses below 150 GeV. In an effective theory of dark matter production, values of the suppression scale M∗ up to 570 GeV are excluded and the effect of truncation for various coupling values is reported. For the ADD large extra spatial dimension model the search places more stringent limits than earlier searches in the same event topology, excluding MD up to about 2.3 (2.8) TeV for two (six) additional spatial dimensions; the limits are reduced by 20-40% depending on the number of additional spatial dimensions when applying a truncation procedure.
T2  - Journal of High Energy Physics
T1  - Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector
IS  - 6
SP  - 059
DO  - 10.1007/JHEP06(2016)059
ER  - 

@article{
author = "Aaboud, M. and Aad, G. and Abbott, B. and Agatonović-Jovin, Tatjana and Bogavac, D. and Bokan, P. and Dimitrievska, A. and Krstic, J. and Marjanovic, M. and Popovic, D. and Sijacki, Dj. and Simic, Lj. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2016",
abstract = "Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the Large Hadron Collider are reported. The data were collected in proton-proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 3.2 fb−1. The observed data are in agreement with the Standard Model expectations. Exclusion limits are presented in models of new phenomena including pair production of dark matter candidates or large extra spatial dimensions. In a simplified model of dark matter and an axial-vector mediator, the search excludes mediator masses below 710 GeV for dark matter candidate masses below 150 GeV. In an effective theory of dark matter production, values of the suppression scale M∗ up to 570 GeV are excluded and the effect of truncation for various coupling values is reported. For the ADD large extra spatial dimension model the search places more stringent limits than earlier searches in the same event topology, excluding MD up to about 2.3 (2.8) TeV for two (six) additional spatial dimensions; the limits are reduced by 20-40% depending on the number of additional spatial dimensions when applying a truncation procedure.",
journal = "Journal of High Energy Physics",
title = "Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector",
number = "6",
pages = "059",
doi = "10.1007/JHEP06(2016)059"
}

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, T., Bogavac, D., Bokan, P., Dimitrievska, A., Krstic, J., Marjanovic, M., Popovic, D., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2016). Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector. in Journal of High Energy Physics(6), 059.
https://doi.org/10.1007/JHEP06(2016)059

Aaboud M, Aad G, Abbott B, Agatonović-Jovin T, Bogavac D, Bokan P, Dimitrievska A, Krstic J, Marjanovic M, Popovic D, Sijacki D, Simic L, Vranjes N, Vranjes Milosavljevic M, Živković L. Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector. in Journal of High Energy Physics. 2016;(6):059.
doi:10.1007/JHEP06(2016)059 .

Aaboud, M., Aad, G., Abbott, B., Agatonović-Jovin, Tatjana, Bogavac, D., Bokan, P., Dimitrievska, A., Krstic, J., Marjanovic, M., Popovic, D., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector" in Journal of High Energy Physics, no. 6 (2016):059,
https://doi.org/10.1007/JHEP06(2016)059 . .

TY  - JOUR
AU  - Aad, G.
AU  - Abbott, B.
AU  - Abdallah, J.
AU  - Agatonović-Jovin, Tatjana
AU  - Bogavac, D.
AU  - Bozic, I.
AU  - Dimitrievska, A.
AU  - Krstic, J.
AU  - Marjanovic, M.
AU  - Popovic, D.
AU  - Sijacki, Dj.
AU  - Simic, Lj.
AU  - Vranjes, N.
AU  - Vranjes Milosavljevic, M.
AU  - Živković, L.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11845
AB  - The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.)− 3.5 + 3.2(syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |Vtb| of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with pT> 25 GeV and |η| < 2.5, one jet with pT> 20 GeV and |η| < 2.5, and ET miss > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.)− 0.07 + 0.07(syst.)±0.03(lumi.) pb.
T2  - Journal of High Energy Physics
T1  - Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
IS  - 1
SP  - 64
DO  - 10.1007/JHEP01(2016)064
ER  - 

@article{
author = "Aad, G. and Abbott, B. and Abdallah, J. and Agatonović-Jovin, Tatjana and Bogavac, D. and Bozic, I. and Dimitrievska, A. and Krstic, J. and Marjanovic, M. and Popovic, D. and Sijacki, Dj. and Simic, Lj. and Vranjes, N. and Vranjes Milosavljevic, M. and Živković, L.",
year = "2016",
abstract = "The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.)− 3.5 + 3.2(syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |Vtb| of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with pT> 25 GeV and |η| < 2.5, one jet with pT> 20 GeV and |η| < 2.5, and ET miss > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.)− 0.07 + 0.07(syst.)±0.03(lumi.) pb.",
journal = "Journal of High Energy Physics",
title = "Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment",
number = "1",
pages = "64",
doi = "10.1007/JHEP01(2016)064"
}

Aad, G., Abbott, B., Abdallah, J., Agatonović-Jovin, T., Bogavac, D., Bozic, I., Dimitrievska, A., Krstic, J., Marjanovic, M., Popovic, D., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M.,& Živković, L.. (2016). Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment. in Journal of High Energy Physics(1), 64.
https://doi.org/10.1007/JHEP01(2016)064

Aad G, Abbott B, Abdallah J, Agatonović-Jovin T, Bogavac D, Bozic I, Dimitrievska A, Krstic J, Marjanovic M, Popovic D, Sijacki D, Simic L, Vranjes N, Vranjes Milosavljevic M, Živković L. Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment. in Journal of High Energy Physics. 2016;(1):64.
doi:10.1007/JHEP01(2016)064 .

Aad, G., Abbott, B., Abdallah, J., Agatonović-Jovin, Tatjana, Bogavac, D., Bozic, I., Dimitrievska, A., Krstic, J., Marjanovic, M., Popovic, D., Sijacki, Dj., Simic, Lj., Vranjes, N., Vranjes Milosavljevic, M., Živković, L., "Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment" in Journal of High Energy Physics, no. 1 (2016):64,
https://doi.org/10.1007/JHEP01(2016)064 . .