Measurement of the CP Asymmetry in B -> X_s gamma

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  • 15 August 2003
Abstract
Direct CP violation in b -> s gamma 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 pseudo-reconstruction technique. In this approach there is negligible contamination from b -> d gamma decays, which are expected to have a much larger CP asymmetry. We find ACP = -0.004 +- 0.051 (stat.) +- 0.038 (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 /fbi recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring.

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