Search for B → ν̄

Marina Artuso,M. Gao, M. Goldberg, D. He,N. Horwitz, G. C. Moneti, R. Mountain, F. Muheim,Yurii V. Mukhin, S. Playfer,Yoram Rozen,Sheldon Stone,Xiangjun Xing, G. Zhu, J. Bartelt,S. E. Csorna, Z. Egyed,Vivek Jain, D. Gibaut,K. Kinoshita, P. Pomianowski,Barry C. Barish, M. Chadha,S. Chan,D. F. Cowen, G. Eigen,J. S. Miller,C. O'Grady,J. Urheim,A. J. Weinstein, Frank Würthwein,D. M. Asner, M. Athanas, D. W. Bliss,W. S. Brower, G. Masek,H. P. Paar, J. Gronberg, C. M. Korte,R. Kutschke, S. Menary,R. J. Morrison, S. Nakanishi,H. N. Nelson,T. K. Nelson, C. Qiao,Jeffrey Richman, D. Roberts,Anders Ryd, H. Tajima,Michael S. Witherell, R. Balest, K. Cho,W. T. Ford, M. Lohner,Harold S. Park, P. Rankin,J. G. Smith, J. P. Alexander, C. Bebek,B. E. Berger, Karl Berkelman,Kenneth Bloom,T. E. Browder,D. G. Cassel,H. A. Cho,D. M. Coffman,D. S. Crowcroft, M. Dickson, P. S. Drell, D. J. Dumas, R. Ehrlich,R. Elia, P. Gaidarev,R. S. Galik,Maurice Garcia-Sciveres, B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley,Shawn W. Henderson,C. D. Jones,S. L. Jones, J. Kandaswamy, N. Katayama,P. C. Kim,D. L. Kreinick,Yanwen Liu,G. S. Ludwig, J. Masui, J. Mevissen,N. B. Mistry,C. R. Ng, E. Nordberg,Juliet Ritchie Patterson, D. Peterson, D. Riley, A. Soffer,Paul Avery, A. P. Freyberger

Physical Review Letters（1995）

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摘要

We search for the decays {ital B}{sup {minus}}{r_arrow}l{sup {minus}}{bar {nu}}{sub l} in a sample of 2.2{times}10{sup 6} charged {ital B} decays using the CLEO detector. We see no evidence for a signal in any channel and set upper limits on the branching fractions of {ital B}({ital B}{sup {minus}}{r_arrow}{tau}{sup {minus}}{bar {nu}}{sub {tau}}){lt}2.2{times}10{sup {minus}3}, {ital B}({ital B}{sup {minus}}{r_arrow}{mu}{sup {minus}}{nu}2;m{sub {mu}}){lt}2.1{times}10{sup {minus}5}, and {ital B}({ital B}{sup {minus}}{r_arrow}{ital e}{sup {minus}}{bar {nu}}{sub {ital e}}){lt}1.5{times}10{sup {minus}5} at the 90% confidence level.

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