A measurement of the decay time-dependent CP-violating asymmetry in Bs0→φφ decays is presented, along with measurements of the T-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between Bs0-B¯s0 mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0fb-1 collected with the LHCb detector, a signal yield of approximately 4000 Bs0→φφ decays is obtained. The CP-violating phase is measured to be φs=-0.17±0.15(stat)±0.03(syst)rad. The triple-product asymmetries are measured to be AU=-0.003±0.017(stat)±0.006(syst) and AV=-0.017±0.017(stat)±0.006(syst). Results are consistent with the hypothesis of CP conservation.
|Titolo:||Measurement of CP violation in Bs0 →φφ decays|
|Parole Chiave:||polarization; asymmetries; tool|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||30-set-2014|
|Digital Object Identifier (DOI):||10.1103/PhysRevD.90.052011|
|Appare nelle tipologie:||01 - Articolo su periodico|