Measurement of the top quark pair production charge asymmetry in proton-proton collisions at root s=7 TeV using the ATLAS detector
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 2, 107- p.Article in journal (Refereed) Published
This paper presents a measurement of the top quark pair () production charge asymmetry A (C) using 4.7 fb(-1) of proton-proton collisions at a centre-of-mass energy root s = 7 TeV collected by the ATLAS detector at the LHC. A -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 event kinematics. A Bayesian unfolding procedure is employed to estimate A (C) at the parton-level. The measured value of the production charge asymmetry is A (C) = 0.006 +/- 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A (C) measurements as a function of the invariant mass, the rapidity and the transverse momentum of the system are also presented. In addition, A (C) is measured for a subset of events with large velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
Place, publisher, year, edition, pages
2014. no 2, 107- p.
IdentifiersURN: urn:nbn:se:uu:diva-224037DOI: 10.1007/JHEP02(2014)107ISI: 000332491600001OAI: oai:DiVA.org:uu-224037DiVA: diva2:714958
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP02(2014)1072014-04-302014-04-302014-04-30Bibliographically approved