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First Measurement of the CP-Violating Phase in B[0 over s]→ϕϕ Decays

Author(s)
Williams, M.
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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%.
Date issued
2013-06
URI
http://hdl.handle.net/1721.1/80752
Department
Massachusetts Institute of Technology. Department of Physics
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
ISSN
0031-9007
1079-7114

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