Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector

A measurement of the top-antitop (t (t) over bar) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb(-1) of LHC pp collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A(C)(ll) based on the identified charged leptons, and A(C)(t (t) over bar), based on the reconstructed t (t) over bar final state. The asymmetries are measured to be A(C)(ll) =0.024 +/- 0.015 (stat.) +/- 0.009 (syst.), A(C)(t (t) over bar) = 0.021 +/- 0.025 (stat.) +/- 0.017 (syst.). The measured values are in agreement with the Standard Model predictions.

Keywords:

Hadron-Hadron Scattering / Top physics

Source:
Journal of High Energy Physics, 2015, 5

Funding / projects:

ANPCyT, Argentina, YerPhI, Armenia, ARC, Australia, BMWFW, Austria, FWF, Austria, ANAS, Azerbaijan, SSTC, Belarus, CNPq, Brazil, FAPESP, Brazil, NSERC, Canada, NRC, Canada, CFI, Canada, CERN, CONICYT, Chile, CAS, China, MOST, China, NSFC, China, COLCIENCIAS, Colombia, MSMT CR, Czech Republic, MPO CR, Czech Republic, VSC CR, Czech Republic, DNRF, Denmark, DNSRC, Denmark, Lundbeck Foundation, Denmark, EPLANET, European Union, ERC, European Union, NSRF, European Union, IN2P3-CNRS, France, CEA-DSM/IRFU, France, GNSF, Georgia, BMBF, Germany, DFG, Germany, HGF, Germany, MPG, Germany, AvH Foundation, Germany, GSRT, Greece, NSRF, Greece, RGC, China, Hong Kong SAR, China, ISF, Israel, MINERVA, Israel, GIF, Israel, I-CORE, Israel, Benoziyo Center, Israel, INFN, Italy, MEXT, Japan, JSPS, Japan, CNRST, Morocco, FOM, Netherlands, NWO, Netherlands, BRF, Norway, RCN, Norway, MNiSW, Poland, NCN, Poland, GRICES, Portugal, FCT, Portugal, MNE/IFA, Romania, MES of Russia, Russian Federation, NRC KI, Russian Federation, JINR, MSTD, Serbia, MSSR, Slovakia, ARRS, Slovenia, MIZS, Slovenia, DST/NRF, South Africa, MINECO, Spain, SRC, Sweden, Wallenberg Foundation, Sweden, SER, Switzerland, SNSF, Switzerland, Cantons of Bern and Geneva, Switzerland, NSC, Taiwan, TAEK, Turkey, STFC, United Kingdom, Royal Society, United Kingdom, Leverhulme Trust, United Kingdom, DOE, United States of America, NSF, United States of America, ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark), NDGF (Norway), NDGF (Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.), BNL (U.S.A.), Tier-2 facilities worldwide, ICREA

DOI: 10.1007/JHEP05(2015)061

ISSN: 1029-8479

WoS: 000356951100004

Scopus: 2-s2.0-84929461885

[ Google Scholar ]



	15
	16

TY  - JOUR
AU  - Aad, G.
AU  - Agatonović-Jovin, Tatjana
AU  - Bozic, I.
AU  - Dimitrievska, A.
AU  - Krstić, Jelena
AU  - Mamužić, Judita
AU  - Marjanović, M.
AU  - Popović, D. S.
AU  - Sijacki, Dj.
AU  - Simić, Lj.
AU  - Vranješ, Nenad
AU  - Vranješ Milosavljević, Marija
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/632
AB  - A measurement of the top-antitop (t (t) over bar) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb(-1) of LHC pp collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A(C)(ll) based on the identified charged leptons, and A(C)(t (t) over bar), based on the reconstructed t (t) over bar final state. The asymmetries are measured to be A(C)(ll) =0.024 +/- 0.015 (stat.) +/- 0.009 (syst.), A(C)(t (t) over bar) = 0.021 +/- 0.025 (stat.) +/- 0.017 (syst.). The measured values are in agreement with the Standard Model predictions.
T2  - Journal of High Energy Physics
T1  - Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector
IS  - 5
DO  - 10.1007/JHEP05(2015)061
ER  -

@article{
author = "Aad, G. and Agatonović-Jovin, Tatjana and Bozic, I. and Dimitrievska, A. and Krstić, Jelena and Mamužić, Judita and Marjanović, M. and Popović, D. S. and Sijacki, Dj. and Simić, Lj. and Vranješ, Nenad and Vranješ Milosavljević, Marija",
year = "2015",
abstract = "A measurement of the top-antitop (t (t) over bar) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb(-1) of LHC pp collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A(C)(ll) based on the identified charged leptons, and A(C)(t (t) over bar), based on the reconstructed t (t) over bar final state. The asymmetries are measured to be A(C)(ll) =0.024 +/- 0.015 (stat.) +/- 0.009 (syst.), A(C)(t (t) over bar) = 0.021 +/- 0.025 (stat.) +/- 0.017 (syst.). The measured values are in agreement with the Standard Model predictions.",
journal = "Journal of High Energy Physics",
title = "Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector",
number = "5",
doi = "10.1007/JHEP05(2015)061"
}

Aad, G., Agatonović-Jovin, T., Bozic, I., Dimitrievska, A., Krstić, J., Mamužić, J., Marjanović, M., Popović, D. S., Sijacki, Dj., Simić, Lj., Vranješ, N.,& Vranješ Milosavljević, M.. (2015). Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector. in Journal of High Energy Physics(5).
https://doi.org/10.1007/JHEP05(2015)061

Aad G, Agatonović-Jovin T, Bozic I, Dimitrievska A, Krstić J, Mamužić J, Marjanović M, Popović DS, Sijacki D, Simić L, Vranješ N, Vranješ Milosavljević M. Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector. in Journal of High Energy Physics. 2015;(5).
doi:10.1007/JHEP05(2015)061 .

Aad, G., Agatonović-Jovin, Tatjana, Bozic, I., Dimitrievska, A., Krstić, Jelena, Mamužić, Judita, Marjanović, M., Popović, D. S., Sijacki, Dj., Simić, Lj., Vranješ, Nenad, Vranješ Milosavljević, Marija, "Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector" in Journal of High Energy Physics, no. 5 (2015),
https://doi.org/10.1007/JHEP05(2015)061 . .