Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at √{s}=8 TeV with the ATLAS detector
Abstract
This paper reports inclusive and differential measurements of the tbar{t} charge asymmetry A_{C} in 20.3 {fb^{-1}} of √{s} = 8 TeV pp collisions recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Three differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the tbar{t} system. The tbar{t} pairs are selected in the single-lepton channels ( e or μ ) with at least four jets, and a likelihood fit is used to reconstruct the tbar{t} event kinematics. A Bayesian unfolding procedure is performed to infer the asymmetry at parton level from the observed data distribution. The inclusive tbar{t} charge asymmetry is measured to be A_{C} = 0.009 ± 0.005 (stat. + syst.). The inclusive and differential measurements are compatible with the values predicted by the Standard Model.
- Publication:
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European Physical Journal C
- Pub Date:
- February 2016
- DOI:
- 10.1140/epjc/s10052-016-3910-6
- arXiv:
- arXiv:1509.02358
- Bibcode:
- 2016EPJC...76...87A
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- 29 pages plus author list (45 pages total), 4 figures, 5 tables, published version including corrections from erratum, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-16/