Search for CP violation in tt¯ production and decay in proton-proton collisions at √s = 8 TeV

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The results of a first search for CP violation in the production and decay of top quark-antiquark ( (t\overline{t}) ) 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})=8TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb⁻¹. 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 (t\overline{t}) production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.

High Energy Physics - Experiment, CP violation, Hadron-Hadron scattering (experiments), Top physics
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., … Woods, N. (2017). Search for CP violation in t t ¯ $t\overline{t}$ production and decay in proton-proton collisions at s = 8 $ \sqrt{s}=8 $ TeV. In Journal of High Energy Physics (Vol. 2017, Issue 3). Springer Science and Business Media LLC.