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

Allison, Lee and Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (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, 2015 (5). 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 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 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.), A tt ¯ C =0.021±0.025(stat.)±0.017(syst.). The measured values are in agreement with the Standard Model predictions.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Additional Information:
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
75468
Deposited By:
Deposited On:
09 Sep 2015 06:34
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Feb 2020 03:50