Measurement of the branching fraction and photon energy moments of B -> Xs gamma and A_CP(B -> X_(s+d) gamma)

Aubert, B.; Barate, R.; Bona, M.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Grauges, E.; Palano, A.; Chen, J.C.; N. D., Q.; Rong, G.; Wang, P.; Zhu, Y.S.; Eigen, G.; Ofte, I.; Stugu, B.; Abrams, G.S.; Battaglia, M.; Brown, D.N.; BUTTON SHAFER, J.; Cahn, R.N.; Charles, E.; Gill, M.S.; Groysman, Y.; Jacobsen, R.G.; Kadyk, J.A.; Kerth, L.T.; Kolomensky, Y.G.; Kukartsev, G.; Lynch, G.; Mir, L.M.; Oddone, P.J.; Orimoto, T.J.; Pripstein, M.; Roe, N.A.; Ronan, M.T.; Wenzel, W.A.; Sanchez, P.D.; Barrett, M.; Ford, K.E.; Harrison, T.J.; Hart, A.J.; Hawkes, C.M.; Morgan, S.E.; Watson, A.T.; Goetzen, K.; Held, T.; Koch, H.; Lewandowski, B.; Pelizaeus, M.; Peters, K.; Schroeder, T.; Steinke, M.; Boyd, J.T.; Burke, J.P.; Cottingham, W.N.; Walker, D.; CUHADAR DONSZELMANN, T.; Fulsom, B.G.; Hearty, C.; Knecht, N.S.; Mattison, T.S.; Mckenna, J.A.; Khan, A.; Kyberd, P.; Saleem, M.; Sherwood, D.J.; Teodorescu, L.; Blinov, V.E.; Bukin, A.D.; Druzhinin, V.P.; Golubev, V.B.; Onuchin, A.P.; Serednyakov, S.I.; Skovpen, Y.I.; Solodov, E.P.; Todyshev, K.Y.; Best, D.S.; Bondioli, M.; Bruinsma, M.; Chao, M.; Curry, S.; Eschrich, I.; Kirkby, D.; Lankford, A.J.; Lund, P.; Mandelkern, M.; Mommsen, R.K.; Roethel, W.; Stoker, D.P.; Abachi, S.; Buchanan, C.; Foulkes, S.D.; Gary, J.W.; Long, O.; Shen, B.C.; Wang, K.; Zhang, L.; Hadavand, H.K.; Hill, E.J.; Paar, H.P.; Rahatlou, S.; Sharma, V.; Berryhill, J.W.; Campagnari, C.; Cunha, A.; Dahmes, B.; Hong, T.M.; Kovalskyi, D.; Richman, J.D.; Beck, T.W.; Eisner, A.M.; Flacco, C.J.; Heusch, C.A.; Kroseberg, J.; Lockman, W.S.; Nesom, G.; Schalk, T.; Schmitz, R.E.; Schumm, B.A.; Seiden, A.; Spradlin, P.; Williams, D.C.; Wilson, M.G.; Albert, J.; Chen, E.; Dvoretskii, A.; Fang, F.; Hitlin, D.G.; Narsky, I.; Piatenko, T.; Porter, F.C.; Ryd, A.; Samuel, A.; Mancinelli, G.; Meadows, B.T.; Sokoloff, M.D.; Blanc, F.; Bloom, P.C.; Chen, S.; Ford, W.T.; Hirschauer, J.F.; Kreisel, A.; Nauenberg, U.; Olivas, A.; Ruddick, W.O.; Smith, J.G.; Ulmer, K.A.; Wagner, S.R.; Zhang, J.; Chen, A.; Eckhart, E.A.; Soffer, A.; Toki, W.H.; Wilson, R.J.; Winklmeier, F.; Zeng, Q.; Altenburg, D.D.; Feltresi, E.; Hauke, A.; Jasper, H.; Petzold, A.; Spaan, B.; Brandt, T.; Klose, V.; Lacker, H.M.; Mader, W.F.; Nogowski, R.; Schubert, J.; Schubert, K.R.; Schwierz, R.; Sundermann, J.E.; Volk, A.; Bernard, D.; Bonneaud, G.R.; Grenier, P.; Latour, E.; Thiebaux, C.; Verderi, M.; Bard, D.J.; Clark, P.J.; Gradl, W.; Muheim, F.; Playfer, S.; Robertson, A.I.; Xie, Y.; Andreotti, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Luppi, E.; Negrini, M.; Petrella, A.; Piemontese, L.; Prencipe, E.; Anulli, F.; BALDINI FERROLI, R.; Calcaterra, A.; DE SANGRO, R.; Finocchiaro, G.; Pacetti, S.; Patteri, P.; Peruzzi, I.M.; Piccolo, M.; Rama, M.; Zallo, A.; Buzzo, A.; Capra, R.; Contri, R.; LO VETERE, M.; Macri, M.M.; Monge, M.R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Santroni, A.; Tosi, S.; Brandenburg, G.; Chaisanguanthum, K.S.; Morii, M.; Wu, J.; Dubitzky, R.S.; Marks, J.; Schenk, S.; Uwer, U.; Bhimji, W.; Bowerman, D.A.; Dauncey, P.D.; Egede, U.; Flack, R.L.; Nash, J.A.; Nikolich, M.B.; Vazquez, W.P.; Chai, X.; Charles, M.J.; Mallik, U.; Meyer, N.T.; Ziegler, V.; Cochran, J.; Crawley, H.B.; Dong, L.; Eyges, V.; Meyer, W.T.; Prell, S.; Rosenberg, E.I.; Rubin, A.E.; Gritsan, A.V.; Fritsch, M.; Schott, G.; Arnaud, N.; Davier, M.; Grosdidier, G.; Cker, A.H.; LE DIBERDER, F.; Lepeltier, V.; Lutz, A.M.; Oyanguren, A.; Pruvot, S.; Rodier, S.; Roudeau, P.; Schune, M.H.; Stocchi, A.; Wang, W.F.; Wormser, G.; Cheng, C.H.; Lange, D.J.; Wright, D.M.; Chavez, C.A.; Forster, I.J.; Fry, J.R.; Gabathuler, E.; Gamet, R.; George, K.A.; Hutchcroft, D.E.; Payne, D.J.; Schofield, K.C.; Touramanis, C.; Bevan, A.J.; DI LODOVICO, F.; Menges, W.; Sacco, R.; Cowan, G.; Flaecher, H.U.; Hopkins, D.A.; Jackson, P.S.; Mcmahon, T.R.; Ricciardi, S.; Salvatore, F.; Wren, A.C.; Brown, D.N.; Davis, C.L.; Allison, J.; Barlow, N.R.; Barlow, R.J.; Chia, Y.M.; Edgar, C.L.; Lafferty, G.D.; Naisbit, M.T.; Williams, J.C.; J. I., Y.; Chen, C.; Hulsbergen, W.D.; Jawahery, A.; Lae, C.K.; Roberts, D.A.; Simi, G.; Blaylock, G.; Dallapiccola, C.; Hertzbach, S.S.; Li, X.; Moore, T.B.; Saremi, S.; Staengle, H.; Cowan, R.; Sciolla, G.; Sekula, S.J.; Spitznagel, M.; Taylor, F.; Yamamoto, R.K.; Kim, H.; Patel, P.M.; Robertson, S.H.; Lazzaro, A.; Lombardo, V.; Palombo, F.; Bauer, J.M.; Cremaldi, L.; Eschenburg, V.; Godang, R.; Kroeger, R.; Sanders, D.A.; Summers, D.J.; Zhao, H.W.; Brunet, S.; Cote, D.; Taras, P.; Viaud, F.B.; Nicholson, H.; Cavallo, N.; DE NARDO, G.; Fabozzi, F.; Gatto, C.; Lista, L.; Monorchio, D.; Paolucci, P.; Piccolo, D.; Sciacca, C.; Baak, M.; Raven, G.; Snoek, H.L.; Jessop, C.P.; Losecco, J.M.; Allmendinger, T.; Benelli, G.; Gan, K.K.; Honscheid, K.; Hufnagel, D.; Jackson, P.D.; Kagan, H.; Kass, R.; Rahimi, A.M.; TER ANTONYAN, R.; Wong, Q.K.; Blount, N.L.; Brau, J.; Frey, R.; Igonkina, O.; Lu, M.; Potter, C.T.; Rahmat, R.; Sinev, N.B.; Strom, D.; Strube, J.; Torrence, E.; Galeazzi, F.; Gaz, A.; Margoni, M.; Morandin, M.; Pompili, A.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Voci, C.; Benayoun, M.; Chauveau, J.; David, P.; DEL BUONO, L.; DE LA VAISSIERE, C.; Hamon, O.; Hartfiel, B.L.; John, M.J.J.; Malcles, J.; Ocariz, J.; Roos, L.; Therin, G.; Behera, P.K.; Gladney, L.; Panetta, J.; Biasini, M.; Covarelli, R.; Angelini, C.; Batignani, G.; Bettarini, S.; Bucci, F.; Calderini, G.; Carpinelli, M.; Cenci, R.; Forti, F.; Giorgi, M.A.; Lusiani, A.; Marchiori, G.; Mazur, M.A.; Morganti, M.; Neri, N.; Paoloni, E.; Rizzo, G.; Walsh, J.J.; Haire, M.; Judd, D.; Wagoner, D.E.; Biesiada, J.; Danielson, N.; Elmer, P.; Lau, Y.P.; Lu, C.; Olsen, J.; Smith, A.J.S.; Telnov, A.V.; Bellini, F.; Cavoto, G.; D'Orazio, A.; DEL RE, D.; DI MARCO, E.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Gioi, L.L.; Mazzoni, M.A.; Morganti, S.; Piredda, G.; Polci, F.; Tehrani, F.S.; Voena, C.; Ebert, M.; Schroder, H.; Waldi, R.; Adye, T.; DE GROOT, N.; Franek, B.; Olaiya, E.O.; Wilson, F.F.; Aleksan, R.; Emery, S.; Gaidot, A.; Ganzhur, S.F.; DE MONCHENAULT, G.H.; Kozanecki, W.; Legendre, M.; Vasseur, G.; Yeche, C.; Zito, M.; Chen, X.R.; Liu, H.; Park, W.; Purohit, M.V.; Wilson, J.R.; Allen, M.T.; Aston, D.; Bartoldus, R.; Bechtle, P.; Berger, N.; Claus, R.; Coleman, J.P.; Convery, M.R.; Cristinziani, M.; Dingfelder, J.C.; Dorfan, J.; DUBOIS FELSMANN, G.P.; Dujmic, D.; Dunwoodie, W.; Field, R.C.; Glanzman, T.; Gowdy, S.J.; Graham, M.T.; Halyo, V.; Hast, C.; Hryn'Ova, T.; Innes, W.R.; Kelsey, M.H.; Kim, P.; Leith, D.W.G.S.; Li, S.; Libby, J.; Luitz, S.; Luth, V.; Lynch, H.L.; Macfarlane, D.B.; Marsiske, H.; Messner, R.; Muller, D.R.; O'Grady, C.P.; Ozcan, V.E.; Perazzo, A.; Perl, M.; Pulliam, T.; Ratcliff, B.N.; Roodman, A.; Salnikov, A.A.; Schindler, R.H.; Schwiening, J.; Snyder, A.; Stelzer, J.; Su, D.; Sullivan, M.K.; Suzuki, K.; Swain, S.K.; Thompson, J.M.; Tinslay, J.S.; Va'Vra, J.; VAN BAKEL, N.; Weaver, M.; Weinstein, A.J.R.; Wisniewski, W.J.; Wittgen, M.; Wright, D.H.; Yarritu, A.K.; Yi, K.; Young, C.C.; Burchat, P.R.; Edwards, A.J.; Majewski, S.A.; Petersen, B.A.; Roat, C.; Wilden, L.; Ahmed, S.; Alam, M.S.; Bula, R.; Ernst, J.A.; Jain, V.; Pan, B.; Saeed, M.A.; Wappler, F.R.; Zain, S.B.; Bugg, W.; Krishnamurthy, M.; Spanier, S.M.; Eckmann, R.; Ritchie, J.L.; Satpathy, A.; Schilling, C.J.; Schwitters, R.F.; Izen, J.M.; Lou, X.C.; Ye, S.; Bianchi, F.; Gallo, F.; Gamba, D.; Bomben, M.; Bosisio, L.; Cartaro, C.; Cossutti, F.; DELLA RICCA, G.; Dittongo, S.; Lanceri, L.; Vitale, L.; Azzolini, V.; MARTINEZ VIDAL, F.; Banerjee, S.; Bhuyan, B.; Brown, C.M.; Fortin, D.; Hamano, K.; Kowalewski, R.; Nugent, I.M.; Roney, J.M.; Sobie, R.J.; Back, J.J.; Harrison, P.F.; Latham, T.E.; Mohanty, G.B.; Pappagallo, M.; Band, H.R.; Chen, X.; Cheng, B.; Dasu, S.; Datta, M.; Flood, K.T.; Hollar, J.J.; Kutter, P.E.; Mellado, B.; Mihalyi, A.; Pan, Y.; Pierini, M.; Prepost, R.; S. L., W.; Yu, Z.; Neal, H.

doi:10.1103/PhysRevLett.97.171803

The photon spectrum in B ->Xs gamma decay, where Xs is any strange hadronic state, is studied using a data sample of 88.5x10^6 e(+)e(-)->Upsilon(4S)-> B Bbar decays collected by the BABAR experiment at the Stanford Linear Accelerator Center. The partial branching fraction, Delta B(B -> Xs gamma)=(3.67 +/- 0.29(stat)+/- 0.34(syst)+/- 0.29(model))x10(-4), the first moment < E_gamma >=2.288 +/- 0.025 +/- 0.017 +/- 0.015 GeV, and the second moment < E_gamma(2) >=0.0328 +/- 0.0040 +/- 0.0023 +/- 0.0036 GeV2 are measured for the photon energy range 1.9 GeV < E_gamma < 2.7 GeV. They are also measured for narrower E_gamma ranges. The moments are then fit to recent theoretical calculations to extract the heavy quark expansion parameters m(b) and mu(2)(pi) and to extrapolate the partial branching fraction to E_gamma > 1.6 GeV. In addition, the direct CP asymmetry A_CP(B -> X_(s+d) gamma) is measured to be -0.110 +/- 0.115(stat)+/- 0.017(syst).

Measurement of the branching fraction and photon energy moments of B -> Xs gamma and A_CP(B -> X_(s+d) gamma) / B. AUBERT, R. BARATE, M. BONA, D. BOUTIGNY, F. COUDERC, Y. KARYOTAKIS, J.P. LEES, V. POIREAU, V. TISSERAND, A. ZGHICHE, E. GRAUGES, A. PALANO, J.C. CHEN, N.D. QI, G. RONG, P. WANG, Y.S. ZHU, G. EIGEN, I. OFTE, B. STUGU, G.S. ABRAMS, M. BATTAGLIA, D.N. BROWN, J. BUTTON-SHAFER, R.N. CAHN, E. CHARLES, M.S. GILL, Y. GROYSMAN, R.G. JACOBSEN, J.A. 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, P.D. SANCHEZ, M. BARRETT, K.E. FORD, T.J. HARRISON, A.J. HART, C.M. HAWKES, S.E. MORGAN, A.T. WATSON, K. GOETZEN, T. HELD, H. KOCH, B. LEWANDOWSKI, M. PELIZAEUS, K. PETERS, T. SCHROEDER, M. STEINKE, J.T. BOYD, J.P. BURKE, W.N. COTTINGHAM, D. WALKER, T. CUHADAR-DONSZELMANN, B.G. FULSOM, C. HEARTY, N.S. KNECHT, T.S. MATTISON, J.A. MCKENNA, A. KHAN, P. KYBERD, M. SALEEM, D.J. SHERWOOD, L. TEODORESCU, V.E. BLINOV, A.D. BUKIN, V.P. DRUZHININ, V.B. GOLUBEV, A.P. ONUCHIN, S.I. SEREDNYAKOV, Y.I. SKOVPEN, E.P. SOLODOV, K.Y. TODYSHEV, D.S. 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, S. ABACHI, C. BUCHANAN, S.D. FOULKES, J.W. GARY, O. LONG, B.C. SHEN, K. WANG, L. ZHANG, H.K. HADAVAND, E.J. HILL, H.P. PAAR, S. RAHATLOU, V. SHARMA, J.W. BERRYHILL, C. CAMPAGNARI, A. CUNHA, B. DAHMES, T.M. HONG, D. KOVALSKYI, J.D. RICHMAN, T.W. BECK, A.M. EISNER, C.J. FLACCO, C.A. HEUSCH, J. KROSEBERG, W.S. LOCKMAN, G. NESOM, T. SCHALK, R.E. SCHMITZ, B.A. SCHUMM, A. SEIDEN, P. SPRADLIN, D.C. WILLIAMS, M.G. WILSON, J. ALBERT, E. CHEN, A. DVORETSKII, F. FANG, D.G. HITLIN, I. NARSKY, T. PIATENKO, F.C. PORTER, A. RYD, A. SAMUEL, G. MANCINELLI, B.T. MEADOWS, M.D. SOKOLOFF, F. BLANC, P.C. BLOOM, S. CHEN, W.T. FORD, J.F. HIRSCHAUER, A. KREISEL, U. NAUENBERG, A. OLIVAS, 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, F. WINKLMEIER, Q. ZENG, D.D. ALTENBURG, E. FELTRESI, A. HAUKE, H. JASPER, A. PETZOLD, B. SPAAN, T. BRANDT, V. KLOSE, H.M. LACKER, W.F. MADER, R. NOGOWSKI, J. SCHUBERT, K.R. SCHUBERT, R. SCHWIERZ, J.E. SUNDERMANN, A. VOLK, D. BERNARD, G.R. BONNEAUD, P. GRENIER, E. LATOUR, C. THIEBAUX, M. VERDERI, D.J. BARD, P.J. CLARK, W. GRADL, F. MUHEIM, S. PLAYFER, A.I. ROBERTSON, Y. XIE, M. ANDREOTTI, D. BETTONI, C. BOZZI, R. CALABRESE, G. CIBINETTO, E. LUPPI, M. NEGRINI, A. PETRELLA, L. PIEMONTESE, E. PRENCIPE, F. ANULLI, R. BALDINI-FERROLI, A. CALCATERRA, R. DE SANGRO, G. FINOCCHIARO, S. PACETTI, P. PATTERI, I.M. PERUZZI, M. PICCOLO, M. RAMA, A. ZALLO, A. BUZZO, R. CAPRA, R. CONTRI, M. LO VETERE, M.M. MACRI, M.R. MONGE, S. PASSAGGIO, C. PATRIGNANI, E. ROBUTTI, A. SANTRONI, S. TOSI, G. BRANDENBURG, K.S. CHAISANGUANTHUM, M. MORII, J. WU, R.S. DUBITZKY, J. MARKS, S. SCHENK, U. UWER, W. BHIMJI, D.A. BOWERMAN, P.D. DAUNCEY, U. EGEDE, R.L. FLACK, J.A. NASH, M.B. NIKOLICH, W.P. VAZQUEZ, X. CHAI, M.J. CHARLES, U. MALLIK, N.T. MEYER, V. ZIEGLER, J. COCHRAN, H.B. CRAWLEY, L. DONG, V. EYGES, W.T. MEYER, S. PRELL, E.I. ROSENBERG, A.E. RUBIN, A.V. GRITSAN, M. FRITSCH, G. SCHOTT, N. ARNAUD, M. DAVIER, G. GROSDIDIER, A.H. CKER, F. LE DIBERDER, V. LEPELTIER, A.M. LUTZ, A. OYANGUREN, S. PRUVOT, S. RODIER, P. ROUDEAU, M.H. SCHUNE, A. STOCCHI, W.F. WANG, G. WORMSER, C.H. CHENG, D.J. LANGE, D.M. WRIGHT, C.A. CHAVEZ, I.J. FORSTER, J.R. FRY, E. GABATHULER, R. GAMET, K.A. GEORGE, D.E. HUTCHCROFT, D.J. PAYNE, K.C. SCHOFIELD, C. TOURAMANIS, A.J. BEVAN, F. DI LODOVICO, W. MENGES, R. SACCO, G. COWAN, H.U. FLAECHER, D.A. HOPKINS, P.S. JACKSON, T.R. MCMAHON, S. RICCIARDI, F. SALVATORE, A.C. WREN, D.N. BROWN, C.L. DAVIS, J. ALLISON, N.R. BARLOW, R.J. BARLOW, Y.M. CHIA, C.L. EDGAR, G.D. LAFFERTY, M.T. NAISBIT, J.C. WILLIAMS, J.I. YI, C. CHEN, W.D. HULSBERGEN, A. JAWAHERY, C.K. LAE, D.A. ROBERTS, G. SIMI, G. BLAYLOCK, C. DALLAPICCOLA, S.S. HERTZBACH, X. LI, T.B. MOORE, S. SAREMI, H. STAENGLE, R. COWAN, 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, D.A. SANDERS, D.J. SUMMERS, H.W. ZHAO, S. BRUNET, D. COTE, P. TARAS, F.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, G. RAVEN, H.L. SNOEK, C.P. JESSOP, J.M. LOSECCO, T. ALLMENDINGER, G. BENELLI, K.K. GAN, K. HONSCHEID, D. HUFNAGEL, P.D. JACKSON, H. KAGAN, R. KASS, A.M. RAHIMI, R. TER-ANTONYAN, Q.K. WONG, N.L. BLOUNT, J. BRAU, R. FREY, O. IGONKINA, M. LU, C.T. POTTER, R. RAHMAT, N.B. SINEV, D. STROM, J. STRUBE, E. TORRENCE, F. GALEAZZI, A. GAZ, M. MARGONI, M. MORANDIN, A. POMPILI, M. POSOCCO, M. ROTONDO, F. SIMONETTO, R. STROILI, C. VOCI, M. BENAYOUN, J. CHAUVEAU, P. DAVID, L. DEL BUONO, C. DE LA VAISSIERE, O. HAMON, B.L. HARTFIEL, M.J.J. JOHN, J. MALCLES, J. OCARIZ, L. ROOS, G. THERIN, P.K. BEHERA, L. GLADNEY, J. PANETTA, M. BIASINI, R. COVARELLI, C. ANGELINI, G. BATIGNANI, S. BETTARINI, F. BUCCI, G. CALDERINI, M. CARPINELLI, R. CENCI, F. FORTI, M.A. GIORGI, A. LUSIANI, G. MARCHIORI, M.A. MAZUR, M. MORGANTI, N. NERI, E. PAOLONI, G. RIZZO, J.J. WALSH, M. HAIRE, D. JUDD, D.E. WAGONER, J. BIESIADA, N. DANIELSON, P. ELMER, Y.P. LAU, C. LU, J. OLSEN, A.J.S. SMITH, A.V. TELNOV, F. BELLINI, G. CAVOTO, A. D'ORAZIO, D. DEL RE, E. DI MARCO, R. FACCINI, F. FERRAROTTO, F. FERRONI, M. GASPERO, L.L. GIOI, M.A. MAZZONI, S. MORGANTI, G. PIREDDA, F. POLCI, F.S. TEHRANI, C. VOENA, M. EBERT, H. SCHRODER, R. WALDI, T. ADYE, N. DE GROOT, B. FRANEK, E.O. OLAIYA, F.F. WILSON, R. ALEKSAN, S. EMERY, A. GAIDOT, S.F. GANZHUR, G.H. DE MONCHENAULT, W. KOZANECKI, M. LEGENDRE, G. VASSEUR, C. YECHE, M. ZITO, X.R. CHEN, H. LIU, W. PARK, M.V. PUROHIT, J.R. WILSON, M.T. ALLEN, D. ASTON, R. BARTOLDUS, P. BECHTLE, N. BERGER, R. CLAUS, J.P. COLEMAN, M.R. CONVERY, M. CRISTINZIANI, J.C. DINGFELDER, J. DORFAN, G.P. DUBOIS-FELSMANN, D. DUJMIC, W. DUNWOODIE, R.C. FIELD, T. GLANZMAN, S.J. GOWDY, M.T. GRAHAM, V. HALYO, C. HAST, T. HRYN'OVA, W.R. INNES, M.H. KELSEY, P. KIM, D.W.G.S. LEITH, S. LI, J. LIBBY, S. LUITZ, V. LUTH, H.L. LYNCH, D.B. MACFARLANE, H. MARSISKE, R. MESSNER, D.R. MULLER, C.P. O'GRADY, V.E. OZCAN, A. PERAZZO, M. PERL, T. PULLIAM, B.N. RATCLIFF, A. ROODMAN, A.A. SALNIKOV, R.H. SCHINDLER, J. SCHWIENING, A. SNYDER, J. STELZER, D. SU, M.K. SULLIVAN, K. SUZUKI, S.K. SWAIN, J.M. THOMPSON, J.S. TINSLAY, J. VA'VRA, N. VAN BAKEL, M. WEAVER, A.J.R. WEINSTEIN, W.J. WISNIEWSKI, M. WITTGEN, D.H. WRIGHT, A.K. YARRITU, K. YI, C.C. YOUNG, P.R. BURCHAT, A.J. EDWARDS, S.A. MAJEWSKI, B.A. PETERSEN, C. ROAT, L. WILDEN, S. AHMED, M.S. ALAM, R. BULA, J.A. ERNST, V. JAIN, B. PAN, M.A. SAEED, F.R. WAPPLER, S.B. ZAIN, W. BUGG, M. KRISHNAMURTHY, S.M. SPANIER, R. ECKMANN, J.L. RITCHIE, A. SATPATHY, C.J. SCHILLING, R.F. SCHWITTERS, J.M. IZEN, X.C. LOU, S. YE, F. BIANCHI, F. GALLO, D. GAMBA, M. BOMBEN, L. BOSISIO, C. CARTARO, F. COSSUTTI, G. DELLA RICCA, S. DITTONGO, L. LANCERI, L. VITALE, V. AZZOLINI, F. MARTINEZ-VIDAL, S. BANERJEE, B. BHUYAN, C.M. BROWN, D. FORTIN, K. HAMANO, R. KOWALEWSKI, I.M. NUGENT, J.M. RONEY, R.J. SOBIE, J.J. BACK, P.F. HARRISON, T.E. LATHAM, G.B. MOHANTY, M. PAPPAGALLO, H.R. BAND, X. CHEN, B. CHENG, S. DASU, M. DATTA, K.T. FLOOD, J.J. HOLLAR, P.E. KUTTER, B. MELLADO, A. MIHALYI, Y. PAN, M. PIERINI, R. PREPOST, S.L. WU, Z. YU, H. NEAL. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 97:17(2006), pp. 171803.171803-1-171803.171803-7.

Measurement of the branching fraction and photon energy moments of B -> Xs gamma and A_CP(B -> X_(s+d) gamma)

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KUTTER;B. MELLADO;A. MIHALYI;Y. PAN;M. PIERINI;R. PREPOST;S. L. WU;Z. YU;H. NEAL

2006

Abstract

The photon spectrum in B ->Xs gamma decay, where Xs is any strange hadronic state, is studied using a data sample of 88.5x10^6 e(+)e(-)->Upsilon(4S)-> B Bbar decays collected by the BABAR experiment at the Stanford Linear Accelerator Center. The partial branching fraction, Delta B(B -> Xs gamma)=(3.67 +/- 0.29(stat)+/- 0.34(syst)+/- 0.29(model))x10(-4), the first moment < E_gamma >=2.288 +/- 0.025 +/- 0.017 +/- 0.015 GeV, and the second moment < E_gamma(2) >=0.0328 +/- 0.0040 +/- 0.0023 +/- 0.0036 GeV2 are measured for the photon energy range 1.9 GeV < E_gamma < 2.7 GeV. They are also measured for narrower E_gamma ranges. The moments are then fit to recent theoretical calculations to extract the heavy quark expansion parameters m(b) and mu(2)(pi) and to extrapolate the partial branching fraction to E_gamma > 1.6 GeV. In addition, the direct CP asymmetry A_CP(B -> X_(s+d) gamma) is measured to be -0.110 +/- 0.115(stat)+/- 0.017(syst).

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Scheda completa

Scheda completa (DC)

	Parole chiave
	
			B mesons; CP invariance; electromagnetic decays; electron-positron inclusive interactions; standard model
		
	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/01 - Fisica Sperimentale
		
	Data di pubblicazione
	
			2006
		
	Rivista in ANCE
	
			PHYSICAL REVIEW LETTERS
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevLett.97.171803
		
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			Article (author)
		
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			01 - Articolo su periodico

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