# Search for CP violation in $t\overline{t}$ 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 $t\overline{t}$ 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 $\sqrt{s}=8$ TeV 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.

## Abstract

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 $\sqrt{s}=8$ TeV 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.

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