Branching fraction and photon energy spectrum for b --> s gamma

• Published in: Physical review letters 2001-12, Vol.87 (25), p.251807-251807, Article 251807
• Main Authors: Chen, S, Hinson, J W, Lee, J, Miller, D H, Pavlunin, V, Shibata, E I, Shipsey, I P, Cronin-Hennessy, D, Lyon, A L, Thorndike, E H, Coan, T E, Fadeyev, V, Gao, Y S, Maravin, Y, Narsky, I, Stroynowski, R, Ye, J, Wlodek, T, Artuso, M, Benslama, K, Boulahouache, C, Bukin, K, Dambasuren, E, Majumder, G, Mountain, R, Skwarnicki, T, Stone, S, Wang, J C, Wolf, A, Kopp, S, Kostin, M, Mahmood, A H, Csorna, S E, Danko, I, McLean, K W, Xu, Z, Godang, R, Bonvicini, G, Cinabro, D, Dubrovin, M, McGee, S, Zhou, G J, Bornheim, A, Lipeles, E, Pappas, S P, Shapiro, A, Sun, W M, Weinstein, A J, Jaffe, D E, Mahapatra, R, Masek, G, Paar, H P, Asner, D M, Eppich, A, Hill, T S, Morrison, R J, Briere, R A, Chen, G P, Ferguson, T, Vogel, H, Alexander, J P, Bebek, C, Berger, B E, Berkelman, K, Blanc, F, Boisvert, V, Cassel, D G, Drell, P S, Duboscq, J E, Ecklund, K M, Ehrlich, R, Gaidarev, P, Gibbons, L, Gittelman, B, Gray, S W, Hartill, D L, Heltsley, B K, Hsu, L, Jones, C D, Kandaswamy, J, Kreinick, D L, Lohner, M, Magerkurth, A, Meyer, T O, Mistry, N B, Nordberg, E, Palmer, M, Patterson, J R, Peterson, D, Riley, D, Romano, A, Schwarthoff, H, Thayer, J G, Urner, D, Valant-Spaight, B, Viehhauser, G, Warburton, A, Avery, P, Prescott, C, Rubiera, A I
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.87.251807

We have measured the branching fraction and photon energy spectrum for the radiative penguin process b-->s gamma. We find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-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, = 2.346+/-0.032+/-0.011 GeV, and -(2) = 0.0226+/-0.0066+/-0.0020 GeV(2), where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/M(3)(B) and beta(0)alpha(2)(s)) the heavy quark effective theory parameter Lambda = 0.35+/-0.08+/-0.10 GeV.