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Evidence for penguin-diagram decays: First observation of B -> K*(892)gamma
Ammar, Raymond G. Ball, S. Baringer, Philip S. Coppage, Don Copty, N. Davis, Robin E. P. Hancock, N. Kelly, M. Kwak, Nowhan Lam, H.
Ammar, Raymond G.
Ball, S.
Baringer, Philip S.
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kelly, M.
Kwak, Nowhan
Lam, H.
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Abstract
We have observed the decays B0 --> K*(892)0gamma and B- --> K*(892)-gamma, which are evidence for the quark-level process b --> sgamma. The average branching fraction is (4.5 +/- 1.5 +/- 0.9) x 10(-5). This value is consistent with standard model predictions from electromagnetic penguin diagrams.
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1993-08
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AMERICAN PHYSICAL SOC
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p674_1.pdf
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AMMAR, R, BALL, S, et al. EVIDENCE FOR PENGUIN-DIAGRAM DECAYS - 1ST OBSERVATION OF B -] K-ASTERISK(892)GAMMA. PHYSICAL REVIEW LETTERS. August 1993. 71(5) : 674-678