Measurement of the charge asymmetry in top quark pair production in pp collisions at root s=7 TeV using the ATLAS detector
Number of Authors: 3034
2012 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 72, no 6, 2039- p.Article in journal (Refereed) Published
A measurement of the top-antitop production charge asymmetry A(C) is presented using data corresponding to an integrated luminosity of 1.04 fb(-1) of pp collisions at root s = 7 TeV collected by the ATLAS detector at the LHC. Events are selected with a single lepton (electron or muon), missing transverse momentum and at least four jets of which at least one jet is identified as coming from a b-quark. A kinematic fit is used to reconstruct the t (t) over bar event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of A(C) is A(C) =-0.019+/-0.028 (stat.)+/-0.024 (syst.), consistent with the prediction from the MC@NLO Monte Carlo generator of A(C) = 0.006+/-0.002. Measurements of AC in two ranges of invariant mass of the top-antitop pair are also shown.
Place, publisher, year, edition, pages
2012. Vol. 72, no 6, 2039- p.
Parton Distributions, Lhc
IdentifiersURN: urn:nbn:se:kth:diva-100839DOI: 10.1140/epjc/s10052-012-2039-5ISI: 000306059600018ScopusID: 2-s2.0-84864420747OAI: oai:DiVA.org:kth-100839DiVA: diva2:545337
QC 20120820. Author count: 30342012-08-202012-08-20Bibliographically approved