Phys. Rev. Lett.
86,
5661–5665
(2001)
Bounds on the CP Asymmetry in b → sγ Decays
T. E. Coan et al. (CLEO Collaboration)
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T. E. Coan1, V. Fadeyev1, Y. Maravin1, I. Narsky1, R. Stroynowski1, J. Ye1, T. Wlodek1, M. Artuso2, R. Ayad2, C. Boulahouache2, K. Bukin2, E. Dambasuren2, S. Karamov2, G. Majumder2, G. C. Moneti2, R. Mountain2, S. Schuh2, T. Skwarnicki2, S. Stone2, G. Viehhauser2, J. C. Wang2, A. Wolf2, J. Wu2, S. Kopp3, A. H. Mahmood4, S. E. Csorna5, I. Danko5, K. W. McLean5, Z. Xu5, R. Godang6, G. Bonvicini7, D. Cinabro7, M. Dubrovin7, S. McGee7, G. J. Zhou7, E. Lipeles8, S. P. Pappas8, M. Schmidtler8, A. Shapiro8, W. M. Sun8, A. J. Weinstein8, F. Würthwein8,*, D. E. Jaffe9, G. Masek9, H. P. Paar9, E. M. Potter9, S. Prell9, D. M. Asner10, A. Eppich10, T. S. Hill10, R. J. Morrison10, R. A. Briere11, G. P. Chen11, W. T. Ford12, A. Gritsan12, J. Roy12, J. G. Smith12, J. P. Alexander13, R. Baker13, C. Bebek13, B. E. Berger13, K. Berkelman13, F. Blanc13, V. Boisvert13, D. G. Cassel13, P. S. Drell13, K. M. Ecklund13, R. Ehrlich13, A. D. Foland13, P. Gaidarev13, L. Gibbons13, B. Gittelman13, S. W. Gray13, D. L. Hartill13, B. K. Heltsley13, P. I. Hopman13, L. Hsu13, C. D. Jones13, J. Kandaswamy13, D. L. Kreinick13, M. Lohner13, A. Magerkurth13, T. O. Meyer13, N. B. Mistry13, E. Nordberg13, J. R. Patterson13, D. Peterson13, D. Riley13, A. Romano13, J. G. Thayer13, D. Urner13, B. Valant-Spaight13, A. Warburton13, P. Avery14, C. Prescott14, A. I. Rubiera14, H. Stoeck14, J. Yelton14, G. Brandenburg15, A. Ershov15, Y. S. Gao15, D. Y.-J. Kim15, R. Wilson15, T. Bergfeld16, B. I. Eisenstein16, J. Ernst16, G. E. Gladding16, G. D. Gollin16, R. M. Hans16, E. Johnson16, I. Karliner16, M. A. Marsh16, M. Palmer16, C. Plager16, C. Sedlack16, M. Selen16, J. J. Thaler16, J. Williams16, K. W. Edwards17a,17b, R. Janicek18a,18b, P. M. Patel18a,18b, A. J. Sadoff19, R. Ammar20, A. Bean20, D. Besson20, X. Zhao20, S. Anderson21, V. V. Frolov21, Y. Kubota21, S. J. Lee21, R. Mahapatra21, J. J. O'Neill21, R. Poling21, T. Riehle21, 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, J. E. Duboscq23, E. Eckhart23, K. K. Gan23, C. Gwon23, T. Hart23, K. Honscheid23, D. Hufnagel23, H. Kagan23, R. Kass23, T. K. Pedlar23, H. Schwarthoff23, J. B. Thayer23, E. von Toerne23, M. M. Zoeller23, S. J. Richichi24, H. Severini24, P. Skubic24, A. Undrus24, S. Chen25, J. Fast25, J. W. Hinson25, J. Lee25, D. H. Miller25, E. I. Shibata25, I. P. J. Shipsey2,5, V. Pavlunin25, D. Cronin-Hennessy26, A. L. Lyon26, W. Park26, E. H. Thorndike26, C. P. Jessop27, and V. Savinov27 (CLEO Collaboration)
1Southern Methodist University, Dallas, Texas 75275
2Syracuse University, Syracuse, New York 13244
3University of Texas, Austin, Texas 78712
4University of Texas–Pan American, Edinburg, Texas 78539
5Vanderbilt University, Nashville, Tennessee 37235
6Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
7Wayne State University, Detroit, Michigan 48202
8California Institute of Technology, Pasadena, California 91125
9University of California, San Diego, La Jolla, California 92093
10University of California, Santa Barbara, Santa Barbara, California 93106
11Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
12University of Colorado, Boulder, Colorado 80309-0390
13Cornell University, Ithaca, New York 14853
14University of Florida, Gainesville, Florida 32611
15Harvard University, Cambridge, Massachusetts 02138
16University of Illinois, Urbana-Champaign, Illinois 61801
17aCarleton University, Ottawa, Ontario, Canada K1S 5B6
17band the Institute of Particle Physics, Canada
18aMcGill University, Montréal, Québec, Canada H3A 2T8
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
23The Ohio State University, Columbus, Ohio 43210
24University of Oklahoma, Norman, Oklahoma 73019
25Purdue University, West Lafayette, Indiana 47907
26University of Rochester, Rochester, New York 14627
27Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
Received 26 October 2000; published in the issue dated 18 June 2001
We have measured the CP asymmetry ACP≡[Γ(b→sγ)-Γ(b̅ →s̅ γ)]/[Γ(b→sγ)+Γ(b̅ →s̅ γ)] to be ACP = (-0.079±0.108±0.022)(1.0±0.030), implying that, at 90% confidence level, ACP lies between -0.27 and +0.10. These limits rule out some extreme non-standard-model predictions, but are consistent with most, as well as with the standard model.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5661
DOI:
10.1103/PhysRevLett.86.5661
PACS:
11.30.Er, 13.20.He, 13.40.Hq
*Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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