First Measurement of the CP-Violating Phase in B[0 over s]→ϕϕ Decays
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 amplit...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2013
|
| Online Access: | http://hdl.handle.net/1721.1/80752 https://orcid.org/0000-0001-8285-3346 |
| Summary: | 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%. |
|---|