Branching Fraction and Photon Energy Spectrum for bsγ

S. Chen et al. (CLEO Collaboration)
Phys. Rev. Lett. 87, 251807 – Published 3 December 2001
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Abstract

We have measured the branching fraction and photon energy spectrum for the radiative penguin process bsγ. We find B(bsγ)=(3.21±0.43±0.270.10+0.18)×104, where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, Eγ=2.346±0.032±0.011GeV, and Eγ2Eγ2=0.0226±0.0066±0.0020GeV2, where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/MB3 and β0αs2) the heavy quark effective theory parameter Λ¯=0.35±0.08±0.10GeV.

  • Received 16 August 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.251807

©2001 American Physical Society

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Vol. 87, Iss. 25 — 17 December 2001

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