Measurements of the top-antitop quark pair production charge asymmetry in the dilepton channel, characterized by two high-pT leptons (electrons or muons), are presented using data corresponding to an integrated luminosity of 20.3 fb-1 from pp collisions at a center-of-mass energy s=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the tt system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: ACℓℓ based on the selected leptons and ACtt based on the reconstructed tt final state. The inclusive asymmetries are measured in the full phase space to be ACℓℓ=0.008±0.006 and ACtt=0.021±0.016, which are in agreement with the Standard Model predictions of ACℓℓ=0.0064±0.0003 and ACtt=0.0111±0.0004.
Aad, G., Ceradini, F., Di Micco, B., Di Nardo, R., Orestano, D., Petrucci, F., et al. (2016). Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at s =8 TeV with the ATLAS detector. PHYSICAL REVIEW D, 94(3).
Titolo: | Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at s =8 TeV with the ATLAS detector |
Autori: | |
Data di pubblicazione: | 2016 |
Rivista: | |
Citazione: | Aad, G., Ceradini, F., Di Micco, B., Di Nardo, R., Orestano, D., Petrucci, F., et al. (2016). Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at s =8 TeV with the ATLAS detector. PHYSICAL REVIEW D, 94(3). |
Handle: | http://hdl.handle.net/11590/314959 |
Appare nelle tipologie: | 1.1 Articolo in rivista |