First Measurement of the CP-Violating Phase in B[0 over s]→ϕϕ Decays
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Aaij-2013-First measurement of the CP-violating phase.pdf
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293.88 KB
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Author(s)
Williams, M.
Date Issued
June 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
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
Version
Final published version
Abstract
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%.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.241802
