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 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 tt¯ production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.[Figure not available: see fulltext.]

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2017). Search for CP violation in tt¯ 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 tt¯ production and decay in proton-proton collisions at √s=8 TeV

BRIANZA, LUCA;BRIVIO, FRANCESCO;DINARDO, MAURO EMANUELE;FIORENDI, SARA;GHEZZI, ALESSIO;GOVONI, PIETRO;MALBERTI, MARTINA;MANZONI, RICCARDO ANDREA;MORONI, LUIGI;PAGANONI, MARCO;PIGAZZINI, SIMONE;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;Lucchini, M;De Guio, F;
2017

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 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 tt¯ production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.[Figure not available: see fulltext.]
Articolo in rivista - Articolo scientifico
CP violation; Hadron-Hadron scattering (experiments); Top physics; Nuclear and High Energy Physics
English
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2017). Search for CP violation in tt¯ 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/10281/153053
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