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

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Asilar, E. and Bergauer, T. and Brandstetter, J. and Brondolin, E. and Dragicevic, M. and Ero, J. and Flechl, M. and Friedl, M. and Fruhwirth, R. and Ghete, V. M. and Hartl, C. and Hormann, N. and Hrubec, J. and Jeitler, M. and Konig, A. and Kratschmer, I. and Liko, D. and Matsushita, T. and Mikulec, I. and Rabady, D. and Rad, N. and Rahbaran, B. and Rohringer, H. and Schieck, J. and Strauss, J. and Waltenberger, W. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Bartók, Márton and Ujvári, Balázs and Veres, Gábor (2017) Search for CP violation in tt production and decay in proton-proton collisions at √s = 8 TeV. JOURNAL OF HIGH ENERGY PHYSICS (3). ISSN 1126-6708

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Abstract

The results of a first search for CP violation in the production and decay of top quark- antiquark (tt) 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 √s = 8 TeV collected by the CMS ex- periment, 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 mea- sured using four-momentum vectors associated with tt 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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