A measurement of the inclusive $b \rightarrow s \gamma$ branching ratio

Barate, R; Cartwright, S L; Robertson, N A; Kleinknecht, K; Hanke, P; Merle, E; Perret, P; Huang, X; Schneider, O; Corden, M; Negus, P; Jousset, J; Duflot, L; Janot, P; Minard, M N; Schlatter, W D; Jakobs, K; Höcker, A; Proriol, J; Wunsch, M; Kluge, E E; Martin, E B; Tempesta, P; Heusse, P; Dornan, Peter J; Rougé, A; Lemaire, M C; Männer, W; Bloch-Devaux, B; Hansen, P H; Ciulli, V; Haywood, S; Grupen, Claus; Ragusa, F; Beuselinck, R; Finch, A J; Bujosa, G; Ranieri, A; Perrodo, P; Colaleo, A; Henrard, P; Casper, David William; Sander, H G; Martínez, M; Tomalin, I R; Zerwas, D; Harvey, J; Teixeira-Dias, P; Raso, G; Fantechi, R; Giehl, I; Medcalf, T; Schael, S; Rolandi, Luigi; Passalacqua, L; Pérez, P; Emery, S; Dissertori, G; Pascual, A; Verderi, M; Focardi, E; Kuhn, D; Moser, H G; Bonissent, A; Buskulic, Damir; Van Gemmeren, P; Ligabue, F; Batignani, G; Thulasidas, M; González, S; Hagelberg, R; Calderini, G; Falvard, A; Booth, C N; Colrain, P; Graugès-Pous, E; Veillet, J J; Ferrante, I; Williams, M D; Bonneaud, G R; Büscher, V; Clifft, R W; Ciocci, M A; Wasserbaech, S R; Sedgbeer, J K; Ferdi, C; Badaud, F; Hu, H; Rohne, E; Jones, R W L; Orejudos, W; Ruggieri, F; O'Shea, V; Montret, J C; Bright-Thomas, P G; Davier, M; Décamp, D; Alemany, R; Lutz, A M; Gay, P; Schmitt, M; Georgiopoulos, C H; Wright, A E; Wu, X; Murtas, G P; Marinelli, N; Xue, S; Buchmüller, O L; Lançon, E; Scott, I J; Lehraus, Ivan; Benchouk, C; Azzurri, P; Sloan, Terence; Elmer, P; Mir, L M; Greene, A M; Markou, C; Walsh, J; Capon, G; Thomson, E; Podlyski, F; Girtler, P; Chambers, J T; Sciabà, A; Wäänänen, A; Nuzzo, S; De Palma, M; Strong, J A; Lefrançois, J; Blair, G A; Palla, Fabrizio; Hansen, J B; Hansen, J D; Norton, P R; Hansen, J R; Aleppo, M; Coyle, P; Lusiani, A; Vannini, C; Konstantinidis, N P; Pietrzyk, B; Tonelli, G; Pallin, D; Abbaneo, D; Bryant, L M; Greening, T C; Graefe, G; Rousseau, D; Venturi, A; Pepé-Altarelli, M; Nielsen, J; Roussarie, A; Nilsson, B S; Brew, C A J; Tournefier, E; Cattaneo, M; Betteridge, A P; Blondel, A; Werner, S; Berlich, R; Bagliesi, G; Giannini, G; Kim, H Y; Sommer, J; Affholderbach, K; Chazelle, G; Creanza, D; Musolino, G; Spagnolo, P; Lehto, M H; Pacheco, A; Putzer, A; Minten, Adolf G; Drevermann, H; Bowdery, C K; Motsch, F; Lucotte, A; Foster, F; Carr, J; Goodsir, S M; Stephan, F; Williams, M I; Stenzel, H; Bossi, F; Sánchez, F; Smolik, L; Vallage, B; Quast, G; Bencivenni, G; Foà, L; Thompson, L F; Crawford, G; Smith, K; Pan, Y B; Xie, Y; Bourdon, P; Garrido, L; Moutoussi, A; Juste, A; Dhamotharan, S; Thompson, A S; Le Diberder, F R; Vayaki, Anna; Becker, U; Frank, M; Crespo, J M; Monteil, S; Moneta, L; Kelly, M S; Cameron, W; Rudolph, G; Settles, Ronald; Renardy, J F; Teubert, F; Ferguson, D P S; Tenchini, Roberto; Reeve, J; Scarr, J M; Silvestris, L; Gao, Y; Cowan, G D; Michel, B; Ouyang, Q; Curtis, L; Zito, G; Tejessy, W; Gelao, G; Cerutti, F; Seywerd, H C J; Kyriakis, A; Parrini, G; Lütjens, G; Sguazzoni, G; Miquel, R; Forty, Roger W; Xu, R; Schune, M H; Giorgi, M A; Zachariadou, K; Blum, Walter; Ganis, G; Ghete, V M; Armstrong, S R; Deschamps, O; Marrocchesi, P S; Zobernig, G; Siotis, I; Sanguinetti, G; Brandt, S; Aubert, Jean-Jacques; Fernández-Bosman, M; Merino, G; Hayes, O J; Maggi, M; Iaselli, Giuseppe; Maggi, G; Mannocchi, G; Chiarella, V; Kozanecki, Witold; Goy, C; Gobbo, B; Bologna, G; Verdini, P G; Campana, P; Green, M G; Rumpf, M; Renk, B; Dell'Orso, R; Ghez, P; Charles, E; Botterill, David R; Jacholkowska, A; Guicheney, C; Chen, S; Nachtman, J M; Edgecock, T R; Chmeissani, M; Hansper, G; Wiedenmann, W; Simopoulou, Errietta; Rizzo, G; Böhrer, A; Etienne, F; Von Wimmersperg-Töller, J H; Daskalakis, G; Carpinelli, M; Thompson, J C; McNamara, P A; Rensch, B; Jin, S; Colas, P; Laurelli, P; Bozzi, C; Zhao, W; Wachsmuth, H W; Wang, T; Dietl, H; Gregorio, A; Giassi, A; Nash, J; Cordier, A; Wu Sau Lan; Casado, M P; Wolf, G; Black, S N; Antonelli, M; Valassi, Andrea; Callot, O; Antonelli, A; Tricomi, A; Videau, H L; Payre, P; Brient, J C; Lin, J; Ranjard, F; Delfino, M C; Ajaltouni, Ziad J; Rander, J; Kroha, H; Litke, A M; Riu, I; Rosnet, P; Videau, I; Kneringer, E; Pusztaszeri, J F; Grivaz, J F; Zeitnitz, C; Schuller, J P; Boix, G; Forti, F; Selvaggi, G; Boucrot, J; Taylor, G; Fernández, E; Nief, J Y; Saadi, Y; Binnie, David M; Bettarini, S; Felici, G; Mannert, C; Zhang, J; Zhang, L; Johnson, R P; Leroy, O; Geweniger, C; McNeil, M A; Lees, J P; Hughes, G; Kim, D W; Murtas, F; Talby, M; Schwindling, J; Park, I C; Saraiva, P; Halley, A W; Locci, E; Perlas, J A; Jaffe, D E; Lynch, J G; Raine, C; Boccali, T; Messineo, A; Sadouki, A; Dann, J H; Hepp, V; Girone, M; Tittel, K; Buck, P G; Mato, P; Hoffmann, C; Combley, F; Trabelsi, K; Jost, B; Trabelsi, A; Rothberg, J E

doi:10.1016/S0370-2693(98)00404-3

Article
Report number	CERN-EP-98-044
Title	A measurement of the inclusive $b \rightarrow s \gamma$ branching ratio
Author(s)	Barate, R ; Buskulic, Damir ; Décamp, D ; Ghez, P ; Goy, C ; Lees, J P ; Lucotte, A ; Merle, E ; Minard, M N ; Nief, J Y ; Pietrzyk, B ; Alemany, R ; Boix, G ; Casado, M P ; Chmeissani, M ; Crespo, J M ; Delfino, M C ; Fernández, E ; Fernández-Bosman, M ; Garrido, L ; Graugès-Pous, E ; Juste, A ; Martínez, M ; Merino, G ; Miquel, R ; Mir, L M ; Park, I C ; Pascual, A ; Perlas, J A ; Riu, I ; Sánchez, F ; Colaleo, A ; Creanza, D ; De Palma, M ; Gelao, G ; Iaselli, Giuseppe ; Maggi, G ; Maggi, M ; Nuzzo, S ; Ranieri, A ; Raso, G ; Ruggieri, F ; Selvaggi, G ; Silvestris, L ; Tempesta, P ; Tricomi, A ; Zito, G ; Huang, X ; Lin, J ; Ouyang, Q ; Wang, T ; Xie, Y ; Xu, R ; Xue, S ; Zhang, J ; Zhang, L ; Zhao, W ; Abbaneo, D ; Becker, U ; Bright-Thomas, P G ; Casper, David William ; Cattaneo, M ; Ciulli, V ; Dissertori, G ; Drevermann, H ; Forty, Roger W ; Frank, M ; Hagelberg, R ; Hansen, J B ; Harvey, J ; Janot, P ; Jost, B ; Lehraus, Ivan ; Mato, P ; Minten, Adolf G ; Moneta, L ; Pacheco, A ; Pusztaszeri, J F ; Ranjard, F ; Rolandi, Luigi ; Rousseau, D ; Schlatter, W D ; Schmitt, M ; Schneider, O ; Tejessy, W ; Teubert, F ; Tomalin, I R ; Wachsmuth, H W ; Ajaltouni, Ziad J ; Badaud, F ; Chazelle, G ; Deschamps, O ; Falvard, A ; Ferdi, C ; Gay, P ; Guicheney, C ; Henrard, P ; Jousset, J ; Michel, B ; Monteil, S ; Montret, J C ; Pallin, D ; Perret, P ; Podlyski, F ; Proriol, J ; Rosnet, P ; Hansen, J D ; Hansen, J R ; Hansen, P H ; Nilsson, B S ; Rensch, B ; Wäänänen, A ; Daskalakis, G ; Kyriakis, A ; Markou, C ; Simopoulou, Errietta ; Siotis, I ; Vayaki, Anna ; Blondel, A ; Bonneaud, G R ; Brient, J C ; Bourdon, P ; Rougé, A ; Rumpf, M ; Valassi, Andrea ; Verderi, M ; Videau, H L ; Focardi, E ; Parrini, G ; Zachariadou, K ; Corden, M ; Georgiopoulos, C H ; Jaffe, D E ; Antonelli, A ; Bencivenni, G ; Bologna, G ; Bossi, F ; Campana, P ; Capon, G ; Cerutti, F ; Chiarella, V ; Felici, G ; Laurelli, P ; Mannocchi, G ; Murtas, F ; Murtas, G P ; Passalacqua, L ; Pepé-Altarelli, M ; Curtis, L ; Halley, A W ; Lynch, J G ; Negus, P ; O'Shea, V ; Raine, C ; Scarr, J M ; Smith, K ; Teixeira-Dias, P ; Thompson, A S ; Thomson, E ; Buchmüller, O L ; Dhamotharan, S ; Geweniger, C ; Graefe, G ; Hanke, P ; Hansper, G ; Hepp, V ; Kluge, E E ; Putzer, A ; Sommer, J ; Tittel, K ; Werner, S ; Wunsch, M ; Beuselinck, R ; Binnie, David M ; Cameron, W ; Dornan, Peter J ; Girone, M ; Goodsir, S M ; Martin, E B ; Marinelli, N ; Moutoussi, A ; Nash, J ; Sedgbeer, J K ; Spagnolo, P ; Williams, M D ; Ghete, V M ; Girtler, P ; Kneringer, E ; Kuhn, D ; Rudolph, G ; Betteridge, A P ; Bowdery, C K ; Buck, P G ; Colrain, P ; Crawford, G ; Finch, A J ; Foster, F ; Hughes, G ; Jones, R W L ; Robertson, N A ; Sloan, Terence ; Williams, M I ; Giehl, I ; Greene, A M ; Hoffmann, C ; Jakobs, K ; Kleinknecht, K ; Quast, G ; Renk, B ; Rohne, E ; Sander, H G ; Van Gemmeren, P ; Zeitnitz, C ; Aubert, Jean-Jacques ; Benchouk, C ; Bonissent, A ; Bujosa, G ; Carr, J ; Coyle, P ; Etienne, F ; Leroy, O ; Motsch, F ; Payre, P ; Talby, M ; Sadouki, A ; Thulasidas, M ; Trabelsi, K ; Aleppo, M ; Antonelli, M ; Ragusa, F ; Berlich, R ; Blum, Walter ; Büscher, V ; Dietl, H ; Ganis, G ; Kroha, H ; Lütjens, G ; Mannert, C ; Männer, W ; Moser, H G ; Schael, S ; Settles, Ronald ; Seywerd, H C J ; Stenzel, H ; Wiedenmann, W ; Wolf, G ; Boucrot, J ; Callot, O ; Chen, S ; Cordier, A ; Davier, M ; Duflot, L ; Grivaz, J F ; Heusse, P ; Höcker, A ; Jacholkowska, A ; Kim, D W ; Le Diberder, F R ; Lefrançois, J ; Lutz, A M ; Schune, M H ; Tournefier, E ; Veillet, J J ; Videau, I ; Zerwas, D ; Azzurri, P ; Bagliesi, G ; Batignani, G ; Bettarini, S ; Boccali, T ; Bozzi, C ; Calderini, G ; Carpinelli, M ; Ciocci, M A ; Dell'Orso, R ; Fantechi, R ; Ferrante, I ; Foà, L ; Forti, F ; Giassi, A ; Giorgi, M A ; Gregorio, A ; Ligabue, F ; Lusiani, A ; Marrocchesi, P S ; Messineo, A ; Palla, Fabrizio ; Rizzo, G ; Sanguinetti, G ; Sciabà, A ; Sguazzoni, G ; Tenchini, Roberto ; Tonelli, G ; Vannini, C ; Venturi, A ; Verdini, P G ; Blair, G A ; Bryant, L M ; Chambers, J T ; Green, M G ; Medcalf, T ; Perrodo, P ; Strong, J A ; Von Wimmersperg-Töller, J H ; Botterill, David R ; Clifft, R W ; Edgecock, T R ; Haywood, S ; Norton, P R ; Thompson, J C ; Wright, A E ; Bloch-Devaux, B ; Colas, P ; Emery, S ; Kozanecki, Witold ; Lançon, E ; Lemaire, M C ; Locci, E ; Pérez, P ; Rander, J ; Renardy, J F ; Roussarie, A ; Schuller, J P ; Schwindling, J ; Trabelsi, A ; Vallage, B ; Black, S N ; Dann, J H ; Johnson, R P ; Kim, H Y ; Konstantinidis, N P ; Litke, A M ; McNeil, M A ; Taylor, G ; Booth, C N ; Brew, C A J ; Cartwright, S L ; Combley, F ; Kelly, M S ; Lehto, M H ; Reeve, J ; Thompson, L F ; Affholderbach, K ; Böhrer, A ; Brandt, S ; Cowan, G D ; Grupen, Claus ; Saraiva, P ; Smolik, L ; Stephan, F ; Giannini, G ; Gobbo, B ; Musolino, G ; Rothberg, J E ; Wasserbaech, S R ; Armstrong, S R ; Charles, E ; Elmer, P ; Ferguson, D P S ; Gao, Y ; González, S ; Greening, T C ; Hayes, O J ; Hu, H ; Jin, S ; McNamara, P A ; Nachtman, J M ; Nielsen, J ; Orejudos, W ; Pan, Y B ; Saadi, Y ; Scott, I J ; Walsh, J ; Wu Sau Lan ; Wu, X ; Zobernig, G ALEPH Collaboration Show all 376 authors
Affiliation	(CERN)
Publication	1998
Imprint	20 Mar 1998
Number of pages	16
Series	(ALEPH Papers)
In:	Phys. Lett. B 429 (1998) 169-187
DOI	10.1016/S0370-2693(98)00404-3
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEP ; ALEPH
Abstract	The flavour changing neutral current decay b -> s gamma has been detected in hadronic Z decays collected by ALEPH at LEP. The signal is isolated in lifetime-tagged b-bbar events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The background processes are normalised from the data themselves. The inclusive branching ratio is measured to be 3.11 +- 0.80_stat +- 0.72_syst DistList PSforwarding done files helpND.html images insert_new.sh insert_new.sh log modify modifying pending running waiting 10**-4, consistent with the Standa rd Model expectation via penguin processes.

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