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

Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2017). Search for CP violation in tt̅ production and decay in proton-proton collisions at √s=8 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2017(3) [10.1007/JHEP03(2017)101].

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

CIOCCI, MARIA AGNESE;MESSINEO, ALBERTO MARIA;
2017-01-01

Abstract

The results of a first search for CP violation in the production and decay of top quark-antiquark (t (t) over 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 root s = 8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7fb(-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 (t) over bar production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.
2017
Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2017). Search for CP violation in tt̅ production and decay in proton-proton collisions at √s=8 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2017(3) [10.1007/JHEP03(2017)101].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1327619