We have searched for the baryon-containing radiative penguin decays B -→Λp̄γ and B-→ Σ0-pγ, using a sample of 9.7 × 106 BB̄ events collected at the Y(45) with the CLEO detector. We find no evidence for either, and set 90% confidence level upper limits of B(B -→Λp̄γ) + 0.3B(B -→Σ0-p̄γ)]Eγ >2.0 GeV<3.3×10-6, [B(B-→Σ 0-p̄γ) + 0-4B(B-→Λp̄γ)] Eγ>2.0Gev<6.4×106. From the latter, we estimate B(B →Xsγy,Xs containing baryons) Eγ>2.0 GeV<3.8×10-5. This limit implies upper limits on corrections to CLEO's recent measurement of branching fraction, mean photon energy, and variance in photon energy from b→sγ that are less than half the combined statistical and systematic errors quoted on these quantities.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)