Using 88.9 million B (B) over bar events collected by the BABAR detector at the Upsilon(4S), we measure the branching fraction for the radiative penguin process B -> X(s)gamma from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E-gamma> 1.9 GeV is B(b -> s gamma)=(3.27 +/- 0.18(stat)(-0.40)(+0.55)(syst)(-0.09)(+0.04)(theory))x10(-4). We also measure the isospin asymmetry between B--> X(s (u) over bar)gamma and (B) over bar (0)-> X(s (d) over bar)gamma to be Delta(0-)=-0.006 +/- 0.058(stat)+/- 0.009(syst)+/- 0.024((B) over bar (0)/B-). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters m(b) and mu(pi)(2). The fitted parameters are consistent with those obtained from semileptonic B -> X(c)l nu decays, and are useful inputs for the extraction of \V-ub\ from measurements of semileptonic B -> X(u)l nu decays.

Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states / B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, J.P. Lees, V. Poireau, V. Tisserand, A. Zghiche, E. Grauges, A. Palano, M. Pappagallo, A. Pompili, J.C. Chen, N.D. Qi, G. Rong, P. Wang, Y.S. Zhu, G. Eigen, I. Ofte, B. Stugu, G.S. Abrams, M. Battaglia, A.B. Breon, D.N. Brown, J. Button-Shafer, R.N. Cahn, E. Charles, C.T. Day, M.S. Gill, A.V. Gritsan, Y. Groysman, R.G. Jacobsen, R.W. Kadel, J. Kadyk, L.T. Kerth, Y.G. Kolomensky, G. Kukartsev, G. Lynch, L.M. Mir, P.J. Oddone, T.J. Orimoto, M. Pripstein, N.A. Roe, M.T. Ronan, W.A. Wenzel, M. Barrett, K.E. Ford, T.J. Harrison, A.J. Hart, C.M. Hawkes, S.E. Morgan, A.T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, K. Peters, T. Schroeder, M. Steinke, J.T. Boyd, J.P. Burke, N. Chevalier, W.N. Cottingham, T. Cuhadar-Donszelmann, B.G. Fulsom, C. Hearty, N.S. Knecht, T.S. Mattison, J.A. McKenna, A. Khan, P. Kyberd, M. Saleem, L. Teodorescu, A.E. Blinov, V.E. Blinov, A.D. Bukin, V.P. Druzhinin, V.B. Golubev, E.A. Kravchenko, A.P. Onuchin, S.I. Serednyakov, Y.I. Skovpen, E.P. Solodov, A.N. Yushkov, D. Best, M. Bondioli, M. Bruinsma, M. Chao, S. Curry, I. Eschrich, D. Kirkby, A.J. Lankford, P. Lund, M. Mandelkern, R.K. Mommsen, W. Roethel, D.P. Stoker, C. Buchanan, B.L. Hartfiel, Falso Weinstein, S.D. Foulkes, J.W. Gary, O. Long, B.C. Shen, K. Wang, L. Zhang, D. del Re, H.K. Hadavand, E.J. Hill, D.B. MacFarlane, H.P. Paar, S. Rahatlou, V. Sharma, J.W. Berryhill, C. Campagnari, A. Cunha, B. Dahmes, T.M. Hong, M.A. Mazur, J.D. Richman, W. Verkerke, T.W. Beck, A.M. Eisner, C.J. Flacco, C.A. Heusch, J. Kroseberg, W.S. Lockman, G. Nesom, T. Schalk, B.A. Schumm, A. Seiden, P. Spradlin, D.C. Williams, M.G. Wilson, J. Albert, E. Chen, G.P. Dubois-Felsmann, A. Dvoretskii, D.G. Hitlin, I. Narsky, T. Piatenko, F.C. Porter, A. Ryd, A. Samuel, R. Andreassen, S. Jayatilleke, G. Mancinelli, B.T. Meadows, M.D. Sokoloff, F. Blanc, P. Bloom, S. Chen, W.T. Ford, J.F. Hirschauer, A. Kreisel, U. Nauenberg, A. Olivas, P. Rankin, W.O. Ruddick, J.G. Smith, K.A. Ulmer, S.R. Wagner, J. Zhang, A. Chen, E.A. Eckhart, A. Soffer, W.H. Toki, R.J. Wilson, Q. Zeng, D. Altenburg, E. Feltresi, A. Hauke, B. Spaan, T. Brandt, J. Brose, M. Dickopp, V. Klose, H.M. Lacker, R. Nogowski, S. Otto, A. Petzold, G. Schott, J. Schubert, K.R. Schubert, R. Schwierz, J.E. Sundermann, D. Bernard, G.R. Bonneaud, P. Grenier, S. Schrenk, C. Thiebaux, G. Vasileiadis, M. Verderi, D.J. Bard, P.J. Clark, W. Gradl, F. Muheim, S. Playfer, Y. Xie, M. Andreotti, V. Azzolini, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Luppi, M. Negrini, L. Piemontese, F. Anulli, R. Baldini-Ferroli, A. Calcaterra, R. de Sangro, G. Finocchiaro, P. Patteri, I.M. Peruzzi, M. Piccolo, A. Zallo, A. Buzzo, R. Capra, R. Contri, M. Lo Vetere, M. Macri, M.R. Monge, S. Passaggio, C. Patrignani, E. Robutti, A. Santroni, S. 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Ricciardi, F. Salvatore, D. Brown, C.L. Davis, J. Allison, N.R. Barlow, R.J. Barlow, C.L. Edgar, M.C. Hodgkinson, M.P. Kelly, G.D. Lafferty, M.T. Naisbit, J.C. Williams, C. Chen, W.D. Hulsbergen, A. Jawahery, D. Kovalskyi, C.K. Lae, D.A. Roberts, G. Simi, G. Blaylock, C. Dallapiccola, S.S. Hertzbach, R. Kofler, V.B. Koptchev, X. Li, T.B. Moore, S. Saremi, H. Staengle, S. Willocq, R. Cowan, K. Koeneke, G. Sciolla, S.J. Sekula, M. Spitznagel, F. Taylor, R.K. Yamamoto, H. Kim, P.M. Patel, S.H. Robertson, A. Lazzaro, V. Lombardo, F. Palombo, J.M. Bauer, L. Cremaldi, V. Eschenburg, R. Godang, R. Kroeger, J. Reidy, D.A. Sanders, D.J. Summers, H.W. Zhao, S. Brunet, D. Cote, P. Taras, B. Viaud, H. Nicholson, N. Cavallo, G. De Nardo, F. Fabozzi, C. Gatto, L. Lista, D. Monorchio, P. Paolucci, D. Piccolo, C. Sciacca, M. Baak, H. Bulten, G. Raven, H.L. Snoek, L. Wilden, C.P. Jessop, J.M. LoSecco, T. Allmendinger, G. Benelli, K.K. Gan, K. Honscheid, D. Hufnagel, P.D. Jackson, H. Kagan, R. Kass, T. 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Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states

A. Lazzaro;V. Lombardo;F. Palombo;N. Neri;
2005

Abstract

Using 88.9 million B (B) over bar events collected by the BABAR detector at the Upsilon(4S), we measure the branching fraction for the radiative penguin process B -> X(s)gamma from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E-gamma> 1.9 GeV is B(b -> s gamma)=(3.27 +/- 0.18(stat)(-0.40)(+0.55)(syst)(-0.09)(+0.04)(theory))x10(-4). We also measure the isospin asymmetry between B--> X(s (u) over bar)gamma and (B) over bar (0)-> X(s (d) over bar)gamma to be Delta(0-)=-0.006 +/- 0.058(stat)+/- 0.009(syst)+/- 0.024((B) over bar (0)/B-). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters m(b) and mu(pi)(2). The fitted parameters are consistent with those obtained from semileptonic B -> X(c)l nu decays, and are useful inputs for the extraction of \V-ub\ from measurements of semileptonic B -> X(u)l nu decays.
B mesons; electromagnetic decays; semileptonic decays
Settore FIS/01 - Fisica Sperimentale
2005
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/16553
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