The charge asymmetry in the production of top quark and antiquark pairs is measured in proton-proton collisions at a center-of-mass energy of 8 TeV. The data, corresponding to an integrated luminosity of19.6 fb−1, were collected by the CMS experiment at the LHC. Events with a single isolated electron or muon, and four or more jets, at least one of which is likely to have originated from hadronization of a bottom quark, are selected. A template technique is used to measure the asymmetry in the distribution of differences in the top quark and antiquark absolute rapidities. The measured asymmetry is Ayc = [0.33± 0.26(stat) ±0.33(syst)]%, which is the most precise result to date. The results are compared to calculations based on the standard model and on several beyond-the-standard-model scenarios.
- Quark production
CMS Collaboration (2016). Measurement of the charge asymmetry in top quark pair production in pp collisions at √s = 8 TeV using a template method. Physical Review D, 93(3), . https://doi.org/10.1103/PhysRevD.93.034014