Phys. Rev. Lett.
74,
2885–2889
(1995)
First Measurement of the Rate for the Inclusive Radiative Penguin Decay b→sγ
M. S. Alam et al. CLEO Collaboration
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M. S. Alam1, I. J. Kim1, Z. Ling1, A. H. Mahmood1, J. J. O'Neill1, H. Severini1, C. R. Sun1, F. Wappler1, G. Crawford2, C. M. Daubenmier2, R. Fulton2, D. Fujino2, K. K. Gan2, K. Honscheid2, H. Kagan2, R. Kass2, J. Lee2, M. Sung2, C. White2, A. Wolf2, M. M. Zoeller2, F. Butler3, X. Fu3, B. Nemati3, W. R. Ross3, P. Skubic3, M. Wood3, M. Bishai4, J. Fast4, E. Gerndt4, J. W. Hinson4, R. L. McIlwain4, T. Miao4, D. H. Miller4, M. Modesitt4, D. Payne4, E. I. Shibata4, I. P. J. Shipsey4, P. N. Wang4, M. Battle5, J. Ernst5, L. Gibbons5, Y. Kwon5, S. Roberts5, E. H. Thorndike5, C. H. Wang5, T. Coan6, J. Dominick6, V. Fadeyev6, I. Korolkov6, M. Lambrecht6, S. Sanghera6, V. Shelkov6, T. Skwarnicki6, R. Stroynowski6, I. Volobouev6, G. Wei6, M. Artuso7, M. Gao7, M. Goldberg7, D. He7, N. Horwitz7, G. C. Moneti7, R. Mountain7, F. Muheim7, Y. Mukhin7, S. Playfer7, Y. Rozen7, S. Stone7, X. Xing7, G. Zhu7, J. Bartelt8, S. E. Csorna8, Z. Egyed8, V. Jain8, D. Gibaut9, K. Kinoshita9, P. Pomianowski9, B. Barish10, M. Chadha10, S. Chan10, D. F. Cowen10, G. Eigen10, J. S. Miller10, C. O'Grady10, J. Urheim10, A. J. Weinstein10, M. Athanas11, W. Brower11, G. Masek11, H. P. Paar11, J. Gronberg12, C. M. Korte12, R. Kutschke12, S. Menary12, R. J. Morrison12, S. Nakanishi12, H. N. Nelson12, T. K. Nelson12, C. Qiao12, J. D. Richman12, A. Ryd12, D. Sperka12, H. Tajima12, M. S. Witherell12, R. Balest13, K. Cho13, W. T. Ford13, D. R. Johnson13, K. Lingel13, M. Lohner13, P. Rankin13, J. G. Smith13, J. P. Alexander14, C. Bebek14, K. Berkelman14, K. Bloom14, T. E. Browder14, D. G. Cassel14, H. A. Cho14, D. M. Coffman14, D. S. Crowcroft14, P. S. Drell14, D. J. Dumas14, R. Ehrlich14, P. Gaidarev14, M. Garcia-Sciveres14, B. Geiser14, B. Gittelman14, S. W. Gray14, D. L. Hartill14, B. K. Heltsley14, S. Henderson14, C. D. Jones14, S. L. Jones14, J. Kandaswamy14, N. Katayama14, P. C. Kim14, D. L. Kreinick14, G. S. Ludwig14, J. Masui14, J. Mevissen14, N. B. Mistry14, C. R. Ng14, E. Nordberg14, J. R. Patterson14, D. Peterson14, D. Riley14, S. Salman14, M. Sapper14, F. Würthwein14, P. Avery15, A. Freyberger15, J. Rodriguez15, S. Yang15, J. Yelton15, D. Cinabro16, T. Liu16, M. Saulnier16, R. Wilson16, H. Yamamoto16, T. Bergfeld17, B. I. Eisenstein17, G. Gollin17, B. Ong17, M. Palmer17, M. Selen17, J. J. Thaler17, K. W. Edwards18, M. Ogg18, A. Bellerive19, D. I. Britton19, E. R. F. Hyatt19, D. B. MacFarlane19, P. M. Patel19, B. Spaan19, A. J. Sadoff20, R. Ammar21, P. Baringer21, A. Bean21, D. Besson21, D. Coppage21, N. Copty21, R. Davis21, N. Hancock21, M. Kelly21, S. Kotov21, I. Kravchenko21, N. Kwak21, H. Lam21, Y. Kubota22, M. Lattery22, M. Momayezi22, J. K. Nelson22, S. Patton22, R. Poling22, V. Savinov22, S. Schrenk22, and R. Wang22 (CLEO Collaboration)
1State University of New York at Albany, Albany, New York 12222
2Ohio State University, Columbus, Ohio, 43210
3University of Oklahoma, Norman, Oklahoma 73019
4Purdue University, West Lafayette, Indiana 47907
5University of Rochester, Rochester, New York 14627
6Southern Methodist University, Dallas, Texas 75275
7Syracuse University, Syracuse, New York 13244
8Vanderbilt University, Nashville, Tennessee 37235
9Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
10California Institute of Technology, Pasadena, California 91125
11University of California, San Diego, La Jolla, California 92093
12University of California, Santa Barbara, California 93106
13University of Colorado, Boulder, Colorado 80309-0390
14Cornell University, Ithaca, New York 14853
15University of Florida, Gainesville, Florida 32611
16Harvard University, Cambridge, Massachusetts 02138
17University of Illinois, Champaign-Urbana, Illinois 61801
18Carleton University, Ottawa, Ontario, Canada K1S 5B6
and the Institute of Particle Physics, Montreal, Canada H3A 2T8
19McGill University, Montréal, Québec, Canada H3A 2T8
and the Institute of Particle Physics, Montreal, Canada H3A 2T8
20Ithaca College, Ithaca, New York 14850
21University of Kansas, Lawrence, Kansas 66045
22University of Minnesota, Minneapolis, Minnesota 55455
Received 13 December 1994; published in the issue dated 10 April 1995
We have measured the inclusive b→sγ branching ratio to be (2.32±0.57±0.35)×10-4, where the first error is statistical and the second is systematic. Upper and lower limits on the branching ratio, each at 95% C.L., are B(b→sγ)<4.2×10-4 and B(b→sγ)>1.0×10-4. These limits restrict the parameters of extensions of the standard model.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.2885
DOI:
10.1103/PhysRevLett.74.2885
PACS:
13.25.Hw, 12.60.-i, 13.40.Hq
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