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Search for the $B_{c}$ meson in hadronic Z decays

A search for the Bc meson decaying into the channels J/psi pi+ and J/psi l nu (l = e or mu) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and...

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Autores principales: Barate, R, Buskulic, Damir, Décamp, D, Ghez, P, Goy, C, Lees, J P, Lucotte, A, Minard, M N, Nief, J Y, Pietrzyk, B, Casado, M P, Chmeissani, M, Comas, P, Crespo, J M, Delfino, M C, Fernández, E, Fernández-Bosman, M, Garrido, L, Juste, A, Martínez, M, Miquel, R, Mir, L M, Orteu, S, Padilla, C, Park, I C, Pascual, A, Perlas, J A, Riu, I, Sánchez, F, Teubert, F, Colaleo, A, Creanza, D, De Palma, M, Gelao, G, Iaselli, Giuseppe, Maggi, G, Maggi, M, Marinelli, N, 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, Alemany, R, Becker, U, Bazarko, A O, Bright-Thomas, P G, Cattaneo, M, Cerutti, F, Drevermann, H, Forty, Roger W, Frank, M, Hagelberg, R, Harvey, J, Janot, P, Jost, B, Kneringer, E, Knobloch, J, Lehraus, Ivan, Lutters, G, Mato, P, Minten, Adolf G, Moneta, L, Pacheco, A, Pusztaszeri, J F, Ranjard, F, Rensing, P E, Rizzo, G, Rolandi, Luigi, Schlatter, W D, Schmitt, M, Schneider, O, Tejessy, W, Tomalin, I R, Wachsmuth, H W, Wagner, A, Ajaltouni, Ziad J, Barrès, A, Boyer, C, 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, Rossignol, J M, Fearnley, Tom, Hansen, J B, 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, Candlin, D J, Parsons, M I, 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, Casper, David William, Chiarella, V, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, G P, Passalacqua, L, Pepé-Altarelli, M, Curtis, L, Dorris, S J, Halley, A W, Knowles, I G, Lynch, J G, O'Shea, V, Raine, C, Scarr, J M, Smith, K, Teixeira-Dias, P, Thompson, A S, Thomson, E, Thomson, F, Turnbull, R M, Geweniger, C, Graefe, G, Hanke, P, Hansper, G, Hepp, V, Kluge, E E, Putzer, A, Schmidt, M, 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, Moutoussi, A, Nash, J, Sedgbeer, J K, Stacey, A M, Williams, M D, Dissertori, G, Girtler, P, Kuhn, D, Rudolph, G, Betteridge, A P, Bowdery, C K, Colrain, P, Crawford, G, Finch, A J, Foster, F, Hughes, G, Sloan, Terence, Williams, M I, Galla, A, 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, Calvet, D, Carr, J, Coyle, P, Diaconu, C A, Etienne, F, Konstantinidis, N P, Leroy, O, Motsch, F, Payre, P, Rousseau, D, Talby, M, Sadouki, A, Thulasidas, M, Trabelsi, K, Aleppo, M, Ragusa, F, Berlich, R, Blum, Walter, Büscher, V, Dietl, H, Dydak, Friedrich, Ganis, G, Gotzhein, C, Kroha, H, Lütjens, G, Lutz, Gerhard, Männer, W, Moser, H G, Richter, R H, Rosado-Schlosser, A, Schael, S, Settles, Ronald, Seywerd, H C J, Saint-Denis, R, Stenzel, H, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Chen, S, Choi, Y, Cordier, A, Davier, M, Duflot, L, Grivaz, J F, Heusse, P, Höcker, A, Jacholkowska, A, Jacquet, M, Kim, D W, Le Diberder, F R, Lefrançois, J, Lutz, A M, Nikolic, I A, Schune, M H, Simion, S, Tournefier, E, Veillet, J J, Videau, I, Zerwas, D, Azzurri, P, Bagliesi, G, Batignani, G, Bettarini, S, Bozzi, C, Calderini, G, Carpinelli, M, Ciocci, M A, Ciulli, V, 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, Sanguinetti, G, Sciabà, A, Spagnolo, P, Steinberger, Jack, Tenchini, Roberto, Tonelli, G, Vannini, C, Venturi, A, Verdini, P G, Blair, G A, Bryant, L M, Chambers, J T, Gao, Y, 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, Maley, P, 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, Litke, A M, McNeil, M A, Taylor, G, Booth, C N, Boswell, R, Brew, C A J, Cartwright, S L, Combley, F, Kelly, M S, Lehto, M H, Newton, W M, Reeve, J, Thompson, L F, Böhrer, A, Brandt, S, Cowan, G D, Grupen, Claus, Saraiva, P, Smolik, L, Stephan, F, Apollonio, M, Bosisio, L, Della Marina, R, 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 S, 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, Yamartino, J M, Zobernig, G
Lenguaje:eng
Publicado: 1997
Materias:
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(97)00461-9
http://cds.cern.ch/record/322714
Descripción
Sumario:A search for the Bc meson decaying into the channels J/psi pi+ and J/psi l nu (l = e or mu) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and 0.81 background events are expected. The following 90\% confidence level upper limits are derived: Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi pi+) < 3.6 10^-5 Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi l nu) < 5.2 10^-5 An additional Bc->J/psi(e+e-) mu nu candidate with very low background probability, found in an independent analysis, is also described in detail.