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  • Precision measurement of the B → Xs γ photon energy spectrum, branching fraction, and direct CP asymmetry A(CP)((B → X(s+d)γ)
    Schroeder, T; Buzykaev, A R; Kravchenko, E A; Onuchin, A P; Long, O; Vitug, G M; Campagnari, C; Hong, T M; Kroseberg, J; Martinez, A J; Cheng, C H; Meadows, B T; Sokoloff, M D; Schubert, K R; Clark, P J; Bozzi, C; Santoro, V; Baldini-Ferroli, R; Finocchiaro, G; Patteri, P; Zallo, A; Guido, E; Lo Vetere, M; Morii, M; Lueck, T; Cochran, J; Grosdidier, G; Le Diberder, F; Schune, M H; Chavez, C A; Gabathuler, E; Hutchcroft, D E; Fritsch, M; Gradl, W; Roberts, D A; Lindemann, D; Neri, N; Palombo, F; Godang, R; Summers, D J; Simard, M; Taras, P; Monorchio, D; Martinelli, M; Knoepfel, K; Kass, R; Frey, R; Lu, M; Margoni, M; Morandin, M; Simi, G; Akar, S; Ben-Haim, E; Bomben, M; Calderini, G; Marchiori, G; Biasini, M; Rossi, A; Angelini, C; Bettarini, S; Casarosa, G; Cervelli, A; Forti, F; Ferrarotto, F; Bünger, C; Leddig, T; Adye, T; Yèche, Ch; Bartoldus, R; Cartaro, C; Dubois-Felsmann, G P; Ebert, M; Graham, M T; Grenier, P; Kelsey, M H; Leith, D W G S; Lynch, H L; Roodman, A; Su, D; Va'vra, J; Wisniewski, W J; Wittgen, M; Young, C C; Park, W; White, R M; Miyashita, T S; Ernst, J A; Peimer, D R; Soffer, A; Wray, B C; Oyanguren, A; Ahmed, H; Albert, J; Bernlochner, F U; Tasneem, N; Harrison, P F; Puccio, E M T; Dasu, S; Prepost, R; Wu, S L

    Physical review letters, 2012-Nov-09, 20121109, Letnik: 109, Številka: 19
    Journal Article

    The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B → X(s)γ plus B → X(d)γ, is studied using a data sample of (382.8 ± 4.2) × 10(6)Υ(4S) → BB decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B → X(s)γ) = (3.21 ± 0.33) × 10(-4) for E(γ) >1.8 GeV and the direct CP asymmetry A(CP) (B → X(s+d)γ) = 0.057 ± 0.063. The effects of detector resolution and Doppler smearing are unfolded to measure the photon energy spectrum in the B meson rest frame.

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