First Measurement of the CP-Violating Phase in B[0 over s]→ϕϕ Decays
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A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B[0 over s]→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B[0 over s]-B̅[0 over s] mixing and the b→ss̅ s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb[superscript -1] and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B[0 over s]→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%.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Aaij, R., C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. “First Measurement of the CP-Violating Phase in B[0 over s]→ϕϕ Decays.” Physical Review Letters 110, no. 24 (June 2013). © 2013 CERN
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