Search for CP violation in t t-bar production and decay in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This study searches for CP violation in top quark-antiquark production and decay at 8 TeV using CMS data, finding no evidence of CP violation, consistent with the standard model predictions.

Contribution

First search for CP violation in t t-bar production and decay using T-odd triple-product correlations in proton-proton collisions at 8 TeV.

Findings

Measured asymmetries show no evidence of CP violation.

Results are consistent with standard model expectations.

Analysis used 19.7 fb^{-1} of CMS data.

Abstract

The results of a first search for CP violation in the production and decay of top quark-antiquark (t t-bar) 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 t t-bar production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.