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

Authors

G. Aad et al. (ATLAS Collaboration, from FZU: J. Chudoba, M. Havránek, J. Hejbal, T. Jakoubek, O. Kepka, A. Kupčo, V. Kůs, M. Lokajíček, R. Lysák, M. Marčišovský, M. Mikeštíková, S. Němeček, P. Šícho, P. Staroba, M. Svatoš, M. Taševský & V. Vrba)

Laboratory / Department
Department of Detector Development and Data Processing
Citation
JHEP 05 (2015) 061
DOI
10.1007/JHEP05(2015)061
Year
2015

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 Att¯C, based on the reconstructed tt final state.

Comparison of measured values of charge asymmetry AC ll and ACtt steoretical forecasts SM. Ellipses correspond to 1σ and 2σ error contours.