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

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Potter, C T, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and others (ATLAS collaboration), (2015) 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, 61. ISSN 1029-8479

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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: A tt/C, based on the reconstructed tt final state. The asymmetries are measured to be
A ll/C = 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.

Item Type: Article
Keywords: Hadron-Hadron Scattering, Top physics
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 21 Jul 2015 06:02
Last Modified: 07 Mar 2017 11:54
URI: http://sro.sussex.ac.uk/id/eprint/55647

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