# Measurement of the top quark pair production charge asymmetry in proton-proton collisions at 7 TeV using the ATLAS detector

Abstract : This letter presents a measurement of the top quark pair (tt) production charge asymmetry Ac using 4.7 fb-1 of proton-proton collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector at the LHC. A tt-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the tt event kinematics. A Bayesian unfolding procedure is employed to estimate Ac at the parton-level. The measured value of the tt production charge asymmetry is 0.006 +/- 0.010, where the uncertainty includes both the statistical and the systematic components. Differential Ac measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt-system are also presented. In addition, Ac is measured for a subset of events with large tt velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
Document type :
Journal articles
Complete list of metadata

http://hal.in2p3.fr/in2p3-00909853
Contributor : Emmanuelle Vernay Connect in order to contact the contributor
Submitted on : Monday, June 7, 2021 - 11:50:05 AM
Last modification on : Thursday, December 16, 2021 - 2:11:29 PM
Long-term archiving on: : Wednesday, September 8, 2021 - 6:31:30 PM

### File

Publisher files allowed on an open archive

### Citation

G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Measurement of the top quark pair production charge asymmetry in proton-proton collisions at 7 TeV using the ATLAS detector. Journal of High Energy Physics, Springer, 2014, 2, pp.107. ⟨10.1007/JHEP02(2014)107⟩. ⟨in2p3-00909853⟩

### Metrics

Les métriques sont temporairement indisponibles