Search for baryons in the radiative penguin decay b→sγ

K. W. Edwards, D. Besson, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. SaleemF. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, G. S. Huang, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, D. Cronin-Hennessy, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan

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6 Scopus citations


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)] >2.0 GeV<3.3×10-6, [B(B-→Σ 0-p̄γ) + 0-4B(B-→Λp̄γ)] >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.

Original languageEnglish (US)
Article number011102
JournalPhysical Review D
Issue number1
StatePublished - Jul 28 2003


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