Measurement of the CP Asymmetry in BXsγ

S. Nishida et al. (Belle Collaboration)
Phys. Rev. Lett. 93, 031803 – Published 16 July 2004

Abstract

Direct CP violation in the bsγ process is a sensitive probe of physics beyond the standard model. We report a measurement of the CP asymmetry in BXsγ, where the hadronic recoil system Xs is reconstructed using a pseudoreconstruction technique. In this approach there is negligible contamination from bdγ decays, which are expected to have a much larger CP asymmetry. We find ACP=0.002±0.050(stat)±0.030(syst) for BXsγ events having recoil mass smaller than 2.1   GeV/c2. The analysis is based on a data sample of 140   fb1 recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e storage ring.

  • Figure
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  • Received 4 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.031803

©2004 American Physical Society

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Vol. 93, Iss. 3 — 16 July 2004

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