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

CollaborationWith : Alexandre, Gauthier / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin
Published in . 2014, vol. 1402, p. 107-145
Collection Open Access - SCOAP3
Abstract This paper presents a measurement of the top quark pair ( $ t\overline{t} $ ) production charge asymmetry A C using 4.7 fb −1 of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A $ t\overline{t} $ -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 $ t\overline{t} $ event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the $ t\overline{t} $ 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 $ t\overline{t} $ system are also presented. In addition, A C is measured for a subset of events with large $ t\overline{t} $ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
Keywords Hadron-Hadron ScatteringTop physics
arXiv: 1311.6724
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ATLAS COLLABORATION. Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector. In: Journal of High Energy Physics, 2014, vol. 1402, p. 107-145. doi: 10.1007/JHEP02(2014)107 https://archive-ouverte.unige.ch/unige:55810

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Deposited on : 2015-04-27

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