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Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at √s = 8 TeV with the ATLAS detector

CollaborationWith : Ancu, Lucian Stefan / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Paolozzi, Lorenzo / Picazio, Attilio / Ristic, Branislav / Schramm, Steven / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in The European Physical Journal. C, Particles and Fields. 2016, vol. 76, no. 2, p. 87
Collection Open Access - SCOAP3
Abstract This paper reports inclusive and differential measurements of the tt¯ charge asymmetry AC in 20.3fb-1 of s=8TeV pp collisions recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Three differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the tt¯ system. The tt¯ pairs are selected in the single-lepton channels ( e or μ ) with at least four jets, and a likelihood fit is used to reconstruct the tt¯ event kinematics. A Bayesian unfolding procedure is performed to infer the asymmetry at parton level from the observed data distribution. The inclusive tt¯ charge asymmetry is measured to be AC=0.009±0.005 (stat. + syst.). The inclusive and differential measurements are compatible with the values predicted by the Standard Model.
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ATLAS COLLABORATION. Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at √s = 8 TeV with the ATLAS detector. In: The European Physical Journal. C, Particles and Fields, 2016, vol. 76, n° 2, p. 87. https://archive-ouverte.unige.ch/unige:81234

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Deposited on : 2016-03-03

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