Measurement of the CP Asymmetry in B -> X_s gamma

Abstract

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 Xs is reconstructed using a pseudo-reconstruction technique. In this approach there is negligible contamination from b->dgamma decays, which are expected to have a much larger CP asymmetry. We find ACP = 0.002 +- 0.050(stat.) +- 0.030(syst.) for B -> Xs gamma events having recoil mass smaller than 2.1 GeV/c^2. The analysis is based on a data sample of 140 /fb recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring.

published version in PRL. (9 pages, 2 postscript figures)

References in corpus (10)

• Branching Fraction and Photon Energy Spectrum b -> s gamma
• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics
• Completing the NLO QCD calculation of B -> Xs gamma
• Probing SUSY-induced CP violations at B factories
• Bounds on the CP Asymmetry in $b\to s\gamma$ Decays
• Direct CP violation in radiative b decays in and beyond the Standard Model
• Radiative B Meson Decays into K pi gamma and K pi pi gamma Final States
• Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks
• Observation of radiative B -> phi K gamma decays

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