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. / The ATLAS Collaboration.

In: European Physical Journal C: Particles and Fields, Vol. 76, 87, 02.2016, p. 1-30.

Research output: Contribution to journalArticlepeer-review



  • The ATLAS Collaboration


This paper reports inclusive and differential measurements of the tt¯ charge asymmetry AC 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 tt¯ system. The tt¯ 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 tt¯ event kinematics. A Bayesian unfolding procedure is performed to infer the asymmetry at parton level from the observed data distribution. The inclusive tt¯ charge asymmetry is measured to be AC=0.009±0.005 (stat. + syst.). The inclusive and differential measurements are compatible with the values predicted by the Standard Model.
Original languageEnglish
Article number87
Pages (from-to)1-30
Number of pages30
JournalEuropean Physical Journal C: Particles and Fields
Early online date19 Feb 2016
Publication statusPublished - Feb 2016
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 27681166