Journal of High Energy Physics > 2015 > 2015 > 5 > 1-50
Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector
Source
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 . . $$ {A}_{\mathrm{C}}^{t\overline{t}}=0.021\pm 0.025\left(\mathrm{stat}.\right)\pm 0.017\left(\mathrm{syst}.\right). $$
The measured values are in agreement with the Standard Model predictions.
Identifiers
journal e-ISSN : | 1029-8479 |
DOI | 10.1007/JHEP05(2015)061 |
Authors
B. Abbott
- University of Oklahoma, Homer L. Dodge Department of Physics and Astronomy, Norman, United States of America