A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between Bs0-B¯s0 mixing and the b→ss¯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 Bs0→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}→ϕϕ Decays
BALDINI, Wander;BOZZI, Concezio;SAVRIE', Mauro;
2013
Abstract
A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between Bs0-B¯s0 mixing and the b→ss¯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 Bs0→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%.File in questo prodotto:
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