Phys. Rev. Lett.
87,
251807
(2001)
[5 pages]
Branching Fraction and Photon Energy Spectrum for b→sγ
S. Chen et al. (CLEO Collaboration)
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S. Chen1, J. W. Hinson1, J. Lee1, D. H. Miller1, V. Pavlunin1, E. I. Shibata1, I. P. J. Shipsey1, D. Cronin-Hennessy2, A. L. Lyon2, E. H. Thorndike2, T. E. Coan3, V. Fadeyev3, Y. S. Gao3, Y. Maravin3, I. Narsky3, R. Stroynowski3, J. Ye3, T. Wlodek3, M. Artuso4, K. Benslama4, C. Boulahouache4, K. Bukin4, E. Dambasuren4, G. Majumder4, R. Mountain4, T. Skwarnicki4, S. Stone4, J. C. Wang4, A. Wolf4, S. Kopp5, M. Kostin5, A. H. Mahmood6, S. E. Csorna7, I. Danko7, K. W. McLean7, Z. Xu7, R. Godang8, G. Bonvicini9, D. Cinabro9, M. Dubrovin9, S. McGee9, G. J. Zhou9, A. Bornheim10, E. Lipeles10, S. P. Pappas10, A. Shapiro10, W. M. Sun10, A. J. Weinstein10, D. E. Jaffe11, R. Mahapatra11, G. Masek11, H. P. Paar11, D. M. Asner12, A. Eppich12, T. S. Hill12, R. J. Morrison12, R. A. Briere13, G. P. Chen13, T. Ferguson13, H. Vogel13, J. P. Alexander14, C. Bebek14, B. E. Berger14, K. Berkelman14, F. Blanc14, V. Boisvert14, D. G. Cassel14, P. S. Drell14, J. E. Duboscq14, K. M. Ecklund14, R. Ehrlich14, P. Gaidarev14, L. Gibbons14, B. Gittelman14, S. W. Gray14, D. L. Hartill14, B. K. Heltsley14, L. Hsu14, C. D. Jones14, J. Kandaswamy14, D. L. Kreinick14, M. Lohner14, A. Magerkurth14, T. O. Meyer14, N. B. Mistry14, E. Nordberg14, M. Palmer14, J. R. Patterson14, D. Peterson14, D. Riley14, A. Romano14, H. Schwarthoff14, J. G. Thayer14, D. Urner14, B. Valant-Spaight14, G. Viehhauser14, A. Warburton14, P. Avery15, C. Prescott15, A. I. Rubiera15, H. Stoeck15, J. Yelton15, G. Brandenburg16, A. Ershov16, D. Y.-J. Kim16, R. Wilson16, T. Bergfeld17, B. I. Eisenstein17, J. Ernst17, G. E. Gladding17, G. D. Gollin17, R. M. Hans17, E. Johnson17, I. Karliner17, M. A. Marsh17, C. Plager17, C. Sedlack17, M. Selen17, J. J. Thaler17, J. Williams17, K. W. Edwards18a,18b, A. J. Sadoff19, R. Ammar20, A. Bean20, D. Besson20, X. Zhao20, S. Anderson21, V. V. Frolov21, Y. Kubota21, S. J. Lee21, R. Poling21, A. Smith21, C. J. Stepaniak21, J. Urheim21, S. Ahmed22, M. S. Alam22, S. B. Athar22, L. Jian22, L. Ling22, M. Saleem22, S. Timm22, F. Wappler22, A. Anastassov23, E. Eckhart23, K. K. Gan23, C. Gwon23, T. Hart23, K. Honscheid23, D. Hufnagel23, H. Kagan23, R. Kass23, T. K. Pedlar23, J. B. Thayer23, E. von Toerne23, M. M. Zoeller23, S. J. Richichi24, H. Severini24, P. Skubic24, A. Undrus24, and V. Savinov25 (CLEO Collaboration)
1Purdue University, West Lafayette, Indiana 47907
2University of Rochester, Rochester, New York 14627
3Southern Methodist University, Dallas, Texas 75275
4Syracuse University, Syracuse, New York 13244
5University of Texas, Austin, Texas 78712
6University of Texas-Pan American, Edinburg, Texas 78539
7Vanderbilt University, Nashville, Tennessee 37235
8Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
9Wayne State University, Detroit, Michigan 48202
10California Institute of Technology, Pasadena, California 91125
11University of California, San Diego, La Jolla, California 92093
12University of California, Santa Barbara, California 93106
13Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
14Cornell University, Ithaca, New York 14853
15University of Florida, Gainesville, Florida 32611
16Harvard University, Cambridge, Massachusetts 02138
17University of Illinois, Urbana-Champaign, Illinois 61801
18aCarleton University, Ottawa, Ontario, Canada K1S 5B6
18band the Institute of Particle Physics, Canada
19Ithaca College, Ithaca, New York 14850
20University of Kansas, Lawrence, Kansas 66045
21University of Minnesota, Minneapolis, Minnesota 55455
22State University of New York at Albany, Albany, New York 12222
23Ohio State University, Columbus, Ohio 43210
24University of Oklahoma, Norman, Oklahoma 73019
25University of Pittsburgh, Pittsburgh, Pennsylvania 15260
Received 16 August 2001; published 3 December 2001
We have measured the branching fraction and photon energy spectrum for the radiative penguin process b→sγ. We find B(b→sγ) = (3.21±0.43±0.27-0.10+0.18)×10-4, where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, 〈Eγ〉 = 2.346±0.032±0.011GeV, and 〈Eγ2〉-〈Eγ〉2 = 0.0226±0.0066±0.0020GeV2, where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/MB3 and β0αs2) the heavy quark effective theory parameter Λ̅ = 0.35±0.08±0.10GeV.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.251807
DOI:
10.1103/PhysRevLett.87.251807
PACS:
13.20.He, 12.39.Hg, 13.40.Hq
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