Jul, 2004
Measurement of the CP asymmetry in B -> X-s gamma
PHYSICAL REVIEW LETTERS
- Volume
- 93
- Number
- 3
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevLett.93.031803
- Publisher
- AMERICAN PHYSICAL SOC
Direct CP violation in the b-->sgamma process is a sensitive probe of physics beyond the standard model. We report a measurement of the CP asymmetry in B-->X(s)gamma, where the hadronic recoil system X-s is reconstructed using a pseudoreconstruction technique. In this approach there is negligible contamination from b-->dgamma decays, which are expected to have a much larger CP asymmetry. We find A(CP)=0.002+/-0.050(stat)+/-0.030(syst) for B-->X(s)gamma events having recoil mass smaller than 2.1 GeV/c(2). The analysis is based on a data sample of 140 fb(-1) recorded at the Y(4S) resonance with the Belle detector at the KEKB e(+)e(-) storage ring.
- Link information
- ID information
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- DOI : 10.1103/PhysRevLett.93.031803
- ISSN : 0031-9007
- Web of Science ID : WOS:000222691900009