# Measurement of CP violation in $B_{s}^{0}$ →ϕϕ decays

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Serra, N; Vollhardt, A; et al (2014). Measurement of CP violation in $B_{s}^{0}$ →ϕϕ decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), 90:052011.

## Abstract

A measurement of the decay time dependent CP-violating asymmetry in B0s→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 B0s-B⎯⎯⎯0s 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 B0s→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.

A measurement of the decay time dependent CP-violating asymmetry in B0s→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 B0s-B⎯⎯⎯0s 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 B0s→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.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2014 24 Feb 2015 09:31 05 Apr 2016 19:00 American Physical Society 1550-2368 https://doi.org/10.1103/PhysRevD.90.05201111&v=5b44bbd4
Permanent URL: https://doi.org/10.5167/uzh-107711