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Title

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at √s = 7 TeV using the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / 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 / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nektarijevic, Snezana / Nessi, Marzio / Nikolics, Katalin / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2015, vol. 1505, p. 061-111
Collection Open Access - SCOAP3
Abstract A measurement of the top-antitop t t ¯ $$ \left(t\overline{t}\right) $$ charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb −1 of LHC pp collisions at a centreof-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A C ℓℓ based on the identified charged leptons, and A C t t ¯ $$ {A}_{\mathrm{C}}^{t\overline{t}} $$ , based on the reconstructed tt final state. The asymmetries are measured to be A C ℓ ℓ = 0.024 ± 0.015 stat . ± 0.009 syst . , $$ {A}_{\mathrm{C}}^{\ell \ell }=0.024\pm 0.015\left(\mathrm{stat}.\right)\pm 0.009\left(\mathrm{syst}.\right), $$ A C t t ¯ = 0.021 ± 0.025 stat . ± 0.017 syst . . $$ {A}_{\mathrm{C}}^{t\overline{t}}=0.021\pm 0.025\left(\mathrm{stat}.\right)\pm 0.017\left(\mathrm{syst}.\right). $$
Keywords Hadron-Hadron ScatteringTop physics
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arXiv: 1501.07383
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ATLAS COLLABORATION. Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at √s = 7 TeV using the ATLAS detector. In: Journal of High Energy Physics, 2015, vol. 1505, p. 061-111. https://archive-ouverte.unige.ch/unige:72944

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Deposited on : 2015-06-02

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