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

G. Aad 1 S. Abdel Khalek 2 A. Bassalat 2 C. Becot 2 S. Binet 2 C. Bourdarios 2 D. Charfeddine 2 J.B. de Vivie De Regie 2 L. Duflot 2 M. Escalier 2 L. Fayard 2 D. Fournier 2 E.L. Gkougkousis 2 J.-F. Grivaz 2 T. Guillemin 2 F. Hariri 2 S. Henrot-Versillé 2 J. Hrivnac 2 L. Iconomidou-Fayard 2 M. Kado 2 A. Lounis 2 N. Makovec 2 C. Nellist L. Poggioli 2 P. Puzo 2 A. Renaud 2 D. Rousseau 2 G. Rybkin 2 A.C. Schaffer 2 E. Scifo 2 L. Serin 2 S. Simion 2 R. Tanaka 2 H.L. Tran 2 D. Zerwas 2 Z. Zhang 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 J. Donini 3 E. Dubreuil 3 N. Ghodbane 3 G. Gilles 3 Gris Ph. 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 F. Podlyski 3 C. Santoni 3 D. Simon 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 S. Albrand 4 J. Brown 4 J. Collot 4 S. Crépé-Renaudin 4 B. Dechenaux 4 P.A. Delsart 4 C. Gabaldon 4 M.H. Genest 4 J.Y. Hostachy 4 F. Ledroit-Guillon 4 A. Lleres 4 A. Lucotte 4 F. Malek 4 C. Monini 4 J. Stark B. Trocmé 4 M. Wu 4 Z. Barnovska 5 N. Berger 5 M. Delmastro 5 L. Di Ciaccio 5 T.K.O. Doan 5 S. Elles 5 T. Hryn’ova 5 S. Jézéquel 5 H. Keoshkerian 5 I. Koletsou 5 R. Lafaye 5 J. Leveque 5 V.P. Lombardo 5 N. Massol 5 G. Sauvage 5 E. Sauvan 5 O. Simard 5 T. Todorov 5 I. Wingerter-Seez 5 L. Alio 1 M. Barbero 1 J. C. Clémens 1 Y. Coadou 1 S. Diglio 1 F. Djama 1 L. Feligioni 1 G.D. Hallewell 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1 L. Vacavant 1 E. Tiouchichine 1
Abstract : A measurement of the top-antitop (tt¯) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb−1 of LHC pp collisions at a centre-of-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: AℓℓC based on the identified charged leptons, and Att¯C, based on the reconstructed tt¯ final state. The asymmetries are measured to be AℓℓC=0.024±0.015 (stat.)±0.009 (syst.), Att¯C=0.021±0.025 (stat.)±0.017 (syst.). The measured values are in agreement with the Standard Model predictions. 2015
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Submitted on : Monday, February 2, 2015 - 11:21:42 AM
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G. Aad, S. Abdel Khalek, A. Bassalat, C. Becot, S. Binet, et al.. Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s√=7 TeV using the ATLAS detector. Journal of High Energy Physics, Springer, 2015, 2015 (5), pp.61. ⟨10.1007/JHEP05(2015)061⟩. ⟨in2p3-01112063⟩

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