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First measurement of the CP-violating phase in B0s→ϕϕ decays

Research output: Contribution to journalArticle

Original languageEnglish
Article number241802
Number of pages8
JournalPhysical Review Letters
Issue number24
Early online date28 Mar 2013
Publication statusPublished - 12 Jun 2013


A first flavour-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-Bˉ0s mixing and the b→ssˉs gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0fb−1 and collected at a centre-of-mass energy of 7TeV 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 68% confidence level. The p-value of the Standard Model prediction is 16%.

ID: 8295051