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. © Published by the American Physical Society.

Measurement of CP violation in Bs0 →φφ decays

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2014-01-01

Abstract

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. © Published by the American Physical Society.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179641
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