Phys. Rev. Lett.
71,
674–678
(1993)
Evidence for penguin-diagram decays: First observation of B→K*(892)γ
R. Ammar et al.
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R. Ammar, S. Ball, P. Baringer, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, N. Kwak, H. Lam, Y. Kubota, M. Lattery, J. K. Nelson, S. Patton, D. Perticone, R. Poling, V. Savinov, S. Schrenk, R. Wang, M. S. Alam, I. J. Kim, B. Nemati, J. J. O’Neill, H. Severini, C. R. Sun, M. M. Zoeller, G. Crawford, M. Daubenmeir, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, R. Malchow, F. Morrow, Y. Skovpen, M. Sung, C. White, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbfleisch, M. Lambrecht, W. R. Ross, P. Skubic, J. Snow, P. L. Wang, M. Wood, D. Bortoletto, D. N. Brown, J. Fast, R. L. McIlwain, T. Miao, D. H. Miller, M. Modesitt, S. F. Schaffner, E. I. Shibata, I. P. J. Shipsey, P. N. Wang, M. Battle, J. Ernst, H. Kroha, S. Roberts, K. Sparks, E. H. Thorndike, C. H. Wang, J. Dominick, S. Sanghera, T. Skwarnicki, R. Stroynowski, M. Artuso, D. He, M. Goldberg, N. Horwitz, R. Kennett, G. C. Moneti, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, G. Zhu, J. Bartelt, S. E. Csorna, Z. Egyed, V. Jain, P. Sheldon, D. S. Akerib, B. Barish, M. Chadha, S. Chan, D. F. Cowen, G. Eigen, J. S. Miller, C. O’Grady, J. Urheim, A. J. Weinstein, D. Acosta, M. Athanas, G. Masek, B. Ong, H. Paar, M. Sivertz, A. Bean, J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson, T. K. Nelson, J. D. Richman, A. Ryd, H. Tajima, D. Schmidt, D. Sperka, M. S. Witherell, M. Procario, S. Yang, R. Balest, K. Cho, M. Daoudi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, J. G. Smith, J. P. Alexander, C. Bebek, K. Berkelman, D. Besson, T. E. Browder, D. G. Cassel, H. A. Cho, D. M. Coffman, P. S. Drell, R. Ehrlich, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, C. D. Jones, S. L. Jones, J. Kandaswamy, N. Katayama, P. C. Kim, D. L. Kreinick, G. S. Ludwig, J. Masui, J. Mevissen, N. B. Mistry, C. R. Ng, E. Nordberg, M. Ogg, J. R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, H. Worden, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, R. Stephens, J. Yelton, D. Cinabro, S. Henderson, K. Kinoshita, T. Liu, M. Saulnier, F. Shen, R. Wilson, H. Yamamoto, M. Selen, and A. J. Sadoff
University of Kansas, Lawrence, Kansas 66045
University of Minnesota, Minneapolis, Minnesota 55455
State University of New York at Albany, Albany, New York 12222
Ohio State University, Columbus, Ohio 43210
University of Oklahoma, Norman, Oklahoma 73019
Purdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
Southern Methodist University, Dallas, Texas 75275
Syracuse University, Syracuse, New York 13244
Vanderbilt University, Nashville, Tennessee 37235
California Institute of Technology, Pasadena, California 91125
University of California, San Diego, La Jolla, California 92093
University of California(enSanta Barbara, Santa Barbara, California 93106
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
University of Colorado, Boulder, Colorado 80309-0390
Cornell University, Ithaca, New York 14853
University of Florida, Gainesville, Florida 32611
Harvard University, Cambridge, Massachusetts 02138
University of Illinois, Champaign-Urbana, Illinois 61801
Ithaca College, Ithaca, New York 14850
Received 24 May 1993; published in the issue dated 2 August 1993
We have observed the decays B0→K*(892)0γ and B-→K*(892)-γ, which are evidence for the quark-level process b→sγ. The average branching fraction is (4.5±1.5±0.9)×10-5. This value is consistent with standard model predictions from electromagnetic penguin diagrams.
© 1993 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.674
DOI:
10.1103/PhysRevLett.71.674
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