A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bbar0s mixing and the b→ssbar-s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0  fb−1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [−2.46,−0.76]  rad at a 68% confidence level. The p value of the standard model prediction is 16%.

First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2013-01-01

Abstract

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-Bbar0s mixing and the b→ssbar-s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0  fb−1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B0s→ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [−2.46,−0.76]  rad at a 68% confidence level. The p value of the standard model prediction is 16%.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/696022
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