Bounds On The Cp Asymmetry In B -> S Gamma Decays

T. E. Coan,V. Fadeyev, Y. Maravin,I. Narsky, R. Stroynowski,J. Ye,T. Wlodek,M. Artuso, R. Ayad, C. Boulahouache,K. Bukin,E. Dambasuren,S. Karamov, G. Majumder,G. C. Moneti,R. Mountain,S. Schuh,T. Skwarnicki,S. Stone,G. Viehhauser, J. C. Wang,A. Wolf,J. Wu,S. Kopp, A. H. Mahmood,S. E. Csorna,I. Danko,K. W. McLean,Z. Xu, R. Godang,G. Bonvicini,D. Cinabro, M. Dubrovin,S. McGee,G. J. Zhou, E. Lipeles, S. P. Pappas,M. Schmidtler,A. Shapiro, W. M. Sun, A. J. Weinstein, F. Würthwein,D. E. Jaffe, G. Masek,H. P. Paar,E. M. Potter,S. Prell,D. M. Asner,A. Eppich,T. S. Hill,R. J. Morrison,R. A. Briere,G. P. Chen,W. T. Ford,A. Gritsan,J. Roy, J. G. Smith, J. P. Alexander,R. Baker,C. Bebek,B. E. Berger,K. Berkelman,F. Blanc, V. Boisvert,D. G. Cassel, P. S. Drell,K. M. Ecklund,R. Ehrlich,A. D. Foland,P. Gaidarev, L. Gibbons,B. Gittelman,S. W. Gray,D. L. Hartill, B. K. Heltsley,P. I. Hopman,L. Hsu, C. D. Jones,J. Kandaswamy,D. L. Kreinick, M. Lohner,A. Magerkurth, T. O. Meyer,N. B. Mistry, E. Nordberg,J. R. Patterson, D. Peterson, D. Riley,A. Romano,J. G. Thayer,D. Urner,B. Valant-Spaight,A. Warburton, P. Avery, C. Prescott,A. I. Rubiera,H. Stoeck,J. Yelton, G. Brandenburg, A. Ershov, Y. S. Gao,D. Y.-J. Kim,R. Wilson,T. Bergfeld, B. I. Eisenstein,J. Ernst,G. E. Gladding,G. D. Gollin,R. M. Hans,E. Johnson, I. Karliner, M. A. Marsh,M. Palmer, C. Plager,C. Sedlack,M. Selen,J. J. Thaler,J. Williams, K. W. Edwards,R. Janicek,P. M. Patel,A. J. Sadoff,R. Ammar,A. Bean, D. Besson,X. Zhao,S. Anderson,V. V. Frolov,Y. Kubota,S. J. Lee,R. Mahapatra,J. J. O'Neill,R. Poling,T. Riehle,A. Smith,C. J. Stepaniak,J. Urheim, S. Ahmed,M. S. Alam,S. B. Athar, L. Jian,L. Ling,M. Saleem,S. Timm,F. Wappler, A. Anastassov,J. E. Duboscq,E. Eckhart,K. K. Gan, C. Gwon,T. Hart,K. Honscheid,D. Hufnagel,H. Kagan, R. Kass, T. K. Pedlar,H. Schwarthoff,J. B. Thayer,E. von Toerne, M. M. Zoeller,S. J. Richichi, H. Severini,P. Skubic, A. Undrus, S. Chen,J. Fast,J. W. Hinson,J. Lee,D. H. Miller,E. I. Shibata, I. P. J. Shipsey, V. Pavlunin, D. Cronin-Hennessy,A. L. Lyon, W. Park,E. H. Thorndike, C. P. Jessop, V. Savinov

PHYSICAL REVIEW LETTERS（2001）

Cited 80|Views98

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Abstract

We have measured the CP asymmetry A(CP) equivalent to [Gamma (b --> sy) - Gamma((b) over bar --> ($) over bar gamma)]/[Gamma (b --> s gamma) + Gamma((b) over bar --> (s) over bar gamma)] to be A(CP) = (-0.079 +/- 0.108 +/- 0.022)(1.0 +/- 0.030), implying that, at 90% confidence level, A(CP) 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.

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Key words

confidence level,standard model

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