First measurement of the CP-violating phase in bs0→φφ decays

The LHCb Collaboration

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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-B̄s0 mixing and the b→ss̄s 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%.

Original languageEnglish
Article number241802
Number of pages8
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 12 Jun 2013
Externally publishedYes

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