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Raniuk, I. R. Kenyon, I. Sepp, I. Shapoval, I. Videau, I. V. Machikhiliyan, J. A. Hernando Morata, J. Albrecht, J. Anderson, J. Beddow, J. Benton, J. Blouw, J. Bressieux, J. Buytaert, J-C. Garnier, J. Closier, J. Cogan, J. Dickens, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J. H. Lopes, J. H. Rademacker, J. Imong, J. J. Back, J. J. Saborido Silva, J. J. Velthuis, J. Keaveney, J. Lefran\\c{c}ois, J. Luisier, J. Magnin, J. Marks, J. McCarthy, J. M. de Miranda, J. Merkel, J. Molina Rodriguez, J. M. Otalora Goicochea, J. Mylroie-Smith, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. van den Brand, J. van Leerdam, J. van Tilburg, J. Visniakov, J. von Loeben, J. Wang, J. Wicht, J. Wishahi, K. Belous, K. Carvalho Akiba, K. Ciba, K. De Bruyn, K. Hennessy, K. Kreplin, K. M\\\"uller, K. Rinnert, K. Senderowska, K. Sobczak, K. Wyllie, L. A. Granado Cardoso, L. Anderlini, L. Carson, L. Del Buono, L. De Paula, L. Eklund, L. Garrido, LHCb collaboration: R. Aaij, L. 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Yang","submitted_at":"2012-09-03T11:41:25Z","abstract_excerpt":"The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of sqrt(s)=7 TeV. The value obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.23 +/- 0.06(stat.) +/- 0.04(syst.) +/- 0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. 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Jean-Marie, B. Jost, B. Khanji, B. K. Pal, B. Liu, B. Muryn, B. Muster, B. Pietrzyk, B. Pie Valls, B. Popovici, B. Rakotomiaramanana, B. Saitta, B. Sanmartin Sedes, B. Schmidt, B. Sciascia, B. Souza De Paula, B. Spaan, B. Storaci, B. Viaud, C. Abellan Beteta, C. Adrover, C. Baesso, C. Barschel, C. Bauer, C. Blanks, C. Bozzi, C. Coca, C. D'Ambrosio, C. Deplano, C. F\\\"arber, C. Farinelli, C. Fitzpatrick, C. Frei, C. Gaspar, C. G\\\"obel, C. Hadjivasiliou, C. Haen, Ch. Cauet, Ch. Elsasser, C. J. Parkinson, C. Langenbruch, C. Lazzeroni, C. Linn, C. Matteuzzi, C. Nguyen-Mau, C. Parkes, C. Patrignani, C. Pavel-Nicorescu, C. Potterat, C. R. Jones, C. Salzmann, C. Santamarina Rios, C. Satriano, C. Thomas, C. Vo{\\ss}, D. A. Milanes, D. A. Roa Romero, D. Brett, D. Craik, D. Decamp, D. Derkach, D. Dossett, D. Elsby, D. Esperante Pereira, D. Galli, D. Gascon, D. Golubkov, D. Hill, D. Hutchcroft, D. Hynds, D. Johnson, D. Lacarrere, D. Lambert, D. L. Perego, D. Martinez Santos, D. Moran, D. Pinci, D. Popov, D. R. Ward, D. Savrina, D. Souza, D. van Eijk, D. Vieira, D. Volyanskyy, D. Voong, D. Websdale, D. Wiedner, E. Aslanides, E. Ben-Haim, E. Cogneras, E. Gersabeck, E. Graug\\'es, E. Greening, E. Gushchin, E. Hicks, E. Jans, E. Lanciotti, E. Lopez Asamar, E. Maurice, E. Perez Trigo, E. Picatoste Olloqui, E. Polycarpo, E. Rodrigues, E. Santovetti, E. Smith, E. Teodorescu, E. Thomas, E. Tournefier, E. van Herwijnen, F. Alessio, F. Archilli, F. Blanc, F. Dettori, F. Domingo Bonal, F. Dordei, F. Dupertuis, F. Eisele, F. Ferreira Rodrigues, F. Fontanelli, F. F. Wilson, F. Jansen, F. Jing, F. J. P. Soler, F. Kruse, F. Machefert, F. Maciuc, F. Muheim, F. Polci, F. Soomro, F. Stagni, F. Teubert, F. Xing, F. Zhang, G. A. Cowan, G. Alkhazov, G. Auriemma, G. Bencivenni, G. Carboni, G. Casse, G. Ciezarek, G. Corti, G. D. Patel, G. Fardell, G. Graziani, G. Haefeli, G. J. Rogers, G. Krocker, G. Lafferty, G. Lanfranchi, G. Liu, G. Manca, G. Mancinelli, G. Martellotti, G. McGregor, G. N. Patrick, G. Passaleva, G. Penso, G. Pessina, G. Polok, G. Raven, G. Sabatino, G. Valenti, G. Veneziano, G. Wilkinson, H. Brown, H. Degaudenzi, H. Dijkstra, H. Gordon, H. Lu, H. Ruiz, H. Schindler, H. V. Cliff, H. Voss, I. Bediaga, I. Belyaev, I. Burducea, I. De Bonis, I. El Rifai, I. Komarov, I. Mous, I. Nasteva, I. Raniuk, I. R. Kenyon, I. Sepp, I. Shapoval, I. Videau, I. V. Machikhiliyan, J. A. Hernando Morata, J. Albrecht, J. Anderson, J. Beddow, J. Benton, J. Blouw, J. Bressieux, J. Buytaert, J-C. Garnier, J. Closier, J. Cogan, J. Dickens, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J. H. Lopes, J. H. Rademacker, J. Imong, J. J. Back, J. J. Saborido Silva, J. J. Velthuis, J. Keaveney, J. Lefran\\c{c}ois, J. Luisier, J. Magnin, J. Marks, J. McCarthy, J. M. de Miranda, J. Merkel, J. Molina Rodriguez, J. M. Otalora Goicochea, J. Mylroie-Smith, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. van den Brand, J. van Leerdam, J. van Tilburg, J. 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Pappagallo, M. Patel, M. Pepe Altarelli, M. Perrin-Terrin, M. Plo Casasus, M. P. Williams, M. Rosello, M. Sannino, M. Sapunov, M. Savrie, M. Schiller, M. Schlupp, M. Schmelling, M. Seco, M. Shapkin, M. Smith, M. S. Rangel, M. Straticiuc, M. Szczekowski, M. Teklishyn, M. Tobin, M. T. Tran, M. Ubeda Garcia, M. van Beuzekom, M. Veltri, M. Vesterinen, M. Whitehead, M. Williams, M. Witek, M. Zangoli, M. Zavertyaev, N. A. Smith, N. Bondar, N. Chiapolini, N. Harnew, N. H. Brook, N. Hussain, N. K. Watson, N. Lopez-March, N. Mangiafave, N. Neufeld, N. Nikitin, N. Rauschmayr, N. Sagidova, N. Serra, N. Torr, N. Tuning, O. Aquines Gutierrez, O. Callot, O. Deschamps, O. Francisco, O. Gr\\\"unberg, O. Kochebina, O. Leroy, O. Maev, O. Okhrimenko, O. Schneider, O. Shevchenko, O. Steinkamp, O. Yushchenko, P. Alvarez Cartelle, P. Campana, P. Chen, P. Collins, P. David, P. De Simone, P. Diniz Batista, P. E. L. Clarke, P. F. Harrison, P. Gandini, Ph. Charpentier, P. Henrard, Ph. Ghez, P. Hopchev, P. Hunt, P. Ilten, P. Jaton, P. Koppenburg, P. Krokovny, P. M. Bj{\\o}rnstad, P. Morawski, P. Naik, P. N. Y. David, P. Owen, P. Perret, P. Robbe, P. Rodriguez Perez, P. Sail, P. Schaack, P. Seyfert, P. Shatalov, P. Spradlin, P. Szczypka, P. Vazquez Regueiro, R. B. Appleby, R. Bernet, R. Cardinale, R. Currie, R. Dzhelyadin, R. Ekelhof, R. F. Koopman, R. Forty, R. Gauld, R. Graciani Diaz, R. Jacobsson, R. J. Barlow, R. Lef\\'evre, R. Le Gac, R. Lindner, R. M\\\"arki, R. McNulty, R. M. D. Mamunur, R. Mountain, R. Muresan, R. Nandakumar, R. Oldeman, R. Santacesaria, R. Santinelli, R. Schwemmer, R. S. Huston, R. Silva Coutinho, R. Vazquez Gomez, R. Waldi, R. Wallace, R. W. Lambert, R. Young, S. Ali, S. Amato, S. A. Wotton, S. Bachmann, S. Barsuk, S. Belogurov, S. Benson, S. Bifani, S. Blusk, S. Borghi, S. Cadeddu, S. C. Haines, S. Cunliffe, S. De Capua, S. Donleavy, S. Easo, S. Eidelman, S. Eisenhardt, S. Farry, S. Filippov, S. Furcas, S. Gregson, S. Hall, S. Hansmann-Menzemer, S. Kandybei, S. Malde, S. Monteil, S. Oggero, S. Ogilvy, S. Perazzini, S. Playfer, S. Redford, S. Ricciardi, S. Roiser, S. Schleich, S. Stahl, S. Stoica, S. Stone, S. Swientek, S. T. Harnew, S. T'Jampens, S. Tolk, S. Topp-Joergensen, S. Tourneur, S. Vecchi, S. Wandernoth, S. Wright, S. Wu, T. Bird, T. Blake, T. Brambach, T. Britton, T. Gershon, T. Gys, T. Hampson, T. Hartmann, Th. Bauer, T. Huse, T. J. V. Bowcock, T. Ketel, T. Kvaratskheliya, T. Latham, T. Lesiak, T. M. Karbach, T. Nakada, T. Nikodem, T. Pila\\v{r}, T. Ruf, T. Shears, T. Skwarnicki, T. Szumlak, U. Egede, U. Kerzel, U. Marconi, U. Straumann, U. Uwer, V. Balagura, V. Bocci, V. Coco, V. Egorychev, V. Fave, V. Fernandez Albor, V. Gibson, V. Heijne, V. Iakovenko, V. K. Subbiah, V. Kudryavtsev, V. Niess, V. N. La Thi, V. Obraztsov, V. Pugatch, V. Romanovsky, V. Shevchenko, V. Tisserand, V. Vagnoni, V. V. Gligorov, V. Vorobyev, W. Baldini, W. Barter, W. Bonivento, W. C. Zhang, W. Hulsbergen, W. Qian, W. Witzeling, X. Cid Vidal, X. Vilasis-Cardona, X. Yuan, Y. Amhis, Y. Gao, Y. Li, Y. M. Kim, Y. Shcheglov, Yu. Guz, Y. Xie, Y. Zhang, Z. Ajaltouni, Z. Mathe, Z. Xing, Z. Yang","submitted_at":"2012-09-03T11:41:25Z","abstract_excerpt":"The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of sqrt(s)=7 TeV. The value obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.23 +/- 0.06(stat.) +/- 0.04(syst.) +/- 0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. 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