Abstract
A first flavor-tagged measurement of the time-dependent -violating asymmetry in decays is presented. In this decay channel, the -violating weak phase arises due to violation in the interference between mixing and the gluonic penguin decay amplitude. Using a sample of collision data corresponding to an integrated luminosity of and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 signal decays are obtained. The -violating phase is measured to be in the interval at a 68% confidence level. The value of the standard model prediction is 16%.
- Received 28 March 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.241802
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© 2013 CERN, for the LHCb Collaboration