Search for B{r_arrow}{mu}{bar {nu}}{sub {mu}}{gamma} and B{r_arrow}e{bar {nu}}{sub e}{gamma}

T. E. Browder, F. Li, Yang Li,J. L. Rodriguez,T. Bergfeld,B. I. Eisenstein, J. A. Ernst,G. E. Gladding,G. D. Gollin,Erik A. Johnson,I. Karliner,M.A. Palmer,Mats A Selen,J. J. Thaler,K. W. Edwards,Alain Bellerive,Dave Britton, R. Janicek,D. B. MacFarlane,K. W. McLean,P. M. Patel,A. J. Sadoff, R. Ammar,Philip Baringer,Alice Bean,D. Z. Besson, D. Coppage,C. Darling, R. Davis, N. Hancock, S. Kotov, Ilya Kravchenko, N. Kwak,S. B. Anderson,Yuichi Kubota, M. Lattery, J. J. O'Neill, S. J. Patton,R. Poling,T. Riehle, A. M. Smith, V. Savinov, Alam,S. B. Athar, Z. Ling,A. H. Mahmood, Horst Severini, S.C. Timm, F. R. Wappler, A. Anastassov, S. Blinov,J. E. Duboscq, R. Fulton, D. Fujino, K. K. Gan,T. Hart,K. Honscheid, H. Kagan, R. D. Kass, June Hyuk Lee, M.K. Sung, Alexander Undrus,R. Wanke,A. Wolf,M. M. Zoeller, B. Nemati,S. J. Richichi,W. R. Ross, P. Skubic, Michael Wood, M. Bishai,James E. Fast, E. Gerndt,J. W. Hinson,D. H. Miller,E. I. Shibata, I. P. J. Shipsey, M. Yurko, L. K. Gibbons,S. D. Johnson,Y. J. Kwon, S. Roberts,E. H. Thorndike,C. P. Jessop, K. Lingel, H. Marsiske,M. L. Perl,S.F. Schaffner, D. Ugolini, R. Wang,X. J. Zhou

Physical Review D（1997）

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摘要

We have searched for the decays B{r_arrow}{mu}{bar {nu}}{sub {mu}}{gamma} and B{r_arrow}e{bar {nu}}{sub e}{gamma} in a sample of 2.7{times}10{sup 6} charged B decays collected with the CLEO II detector. In the muon channel, we observe no candidates in the signal region and set an upper limit on the branching fraction of B(B{r_arrow}{mu}{bar {nu}}{sub {mu}}{gamma}){lt}5.2{times}10{sup {minus}5} at the 90{percent} confidence level. In the electron channel, we observe five candidates in the signal region and set an upper limit on the branching fraction of B(B{r_arrow}e{bar {nu}}{sub e}{gamma}){lt}2.0{times}10{sup {minus}4} at the 90{percent} confidence level. {copyright} {ital 1997} {ital The American Physical Society}

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