Measurements of TT Charge Asymmetry Using Dilepton Final States in PP Collisions at s=8TeV
Physics Letters B 2016
Vardan Khachatryan, A.M. Sirunyan, A. Tumasyan, Viesturs Veckalns

The charge asymmetry in tt‾ events is measured using dilepton final states produced in pp collisions at the LHC at s=8TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5fb−1. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The tt‾ and leptonic inclusive charge asymmetries are found to be 0.011±0.011(stat)±0.007(syst) and 0.003±0.006(stat)±0.003(syst), respectively. These results, as well as charge asymmetry measurements made as a function of the invariant mass, rapidity, and transverse momentum of the tt‾ system, are in agreement with predictions of the standard model.


Keywords
Charge asymmetry | CMS | Physics | Top
DOI
10.1016/j.physletb.2016.07.006
Hyperlink
http://www.sciencedirect.com/science/article/pii/S0370269316303471

Khachatryan, V., Sirunyan, A., Tumasyan, A., Veckalns, V. et al. Measurements of TT Charge Asymmetry Using Dilepton Final States in PP Collisions at s=8TeV. Physics Letters B, 2016, Vol.760, pp.365-386. ISSN 0370-2693. Available from: doi:10.1016/j.physletb.2016.07.006

Publication language
English (en)
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