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.

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

AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;CENNA, FRANCESCA;COSTA, Marco;COVARELLI, Roberto;DEGANO, Alessandro;KIANI, Muhammad Bilal Manzoor;MIGLIORE, Ernesto;MONACO, Vincenzo;MONTEIL, ENNIO;OBERTINO, Maria Margherita;PACHER, LUCA;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;RUSPA, Marta;SACCHI, Roberto;SHCHELINA, KSENIA;SOLA, VALENTINA;SOLANO, Ada Maria;TRACZYK, Piotr wOJCIECH;
2017-01-01

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.
2017
3
101
1
34
http://link.springer.com/journal/13130
CP violation; Hadron-Hadron scattering (experiments); Top physics; Nuclear and High Energy Physics
Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1640066
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