Search for CP violation in top quark-antiquark production and decay in proton-proton collisions at sqrt(s) = 8 TeV

Abstract : The results of a first search for CP violation in the production and decay of top quark-antiquark (ttbar) pairs are presented. The search is based on asymmetries in T-odd, triple-product correlation observables, where T is the time-reversal operator. The analysis uses a sample of proton-proton collisions at sqrt(s)=8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 inverse femtobarns.. Events are selected having one electron or muon and at least four jets. The T-odd observables are measured using four-momentum vectors associated with ttbar production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.
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V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for CP violation in top quark-antiquark production and decay in proton-proton collisions at sqrt(s) = 8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2017, 03 (3), pp.101. ⟨10.1007/JHEP03(2017)101⟩. ⟨in2p3-01404605⟩

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