In a sample of 1.5 million hadronic decays of the Z collected by the ALEPH detector, a search is carried out for the decays (B) over bar --> D-1(0)(2420)l(-)<(nu)over bar>X and (B) over bar --> D-2(*0)(2460)l(-)<(nu)over bar>X. The product branching ratio for D-1(0) production is measured to be Br(b --> (B) over bar) x Br((B) over bar --> D(1)(0)l(-)<(nu)over bar>X) x Br(D-1(0) --> D-*+<pi(-)) = (2.04 +/- 0.58(stat)+/- 0.34(syst) x 10 (-3), and a 95% confidence level limit of Br(b --> (B) over bar) x Br((B) over bar --> D(2)(*0)l(-)<(nu)over bar>X) x Br(D-2(*0) --> D(*+)pi(-)) less than or equal to less than or equal to 0.81 X 10(-3) is obtained for D-2(*0) production. A topological search sensitive to the processes above, but also to wide resonances that decay to D(*+)pi(-) and to non-resonant D(*+)pi(-) production is also carried out, yielding Br(b--> (B) over bar B) xBr((B) over bar -->D(*+)pi(-) l(-)<(nu)over bar>X>)= (3.7 +/- 1.0(stat) +/- 0.7(syst)) x 10(-3). Direct evidence of D(*)pi production inconsistent with D-1(0) and D-2(*0) in semileptonic B decay is presented.

A study of D-asterisk+pi(-)- production in semileptonic B decay / D. Buskulic, D. Casper, I. Debonis, D. Decamp, P. Ghez, C. Goy, J. Lees, M. Minard, P. Odier, B. Pietrzyk, F. Ariztizabal, M. Chmeissani, J. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandezbosman, V. Gaitan, L. Garrido, M. Martinez, S. Orteu, A. Pacheco, C. Padilla, F. Palla, A. Pascual, J. Perlas, F. Sanchez, F. Teubert, D. Creanza, M. Depalma, A. Farilla, G. Iaselli, G. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, A. Engelhardt, R. Forty, M. Frank, G. Ganis, M. Girone, R. Hagelberg, J. Harvey, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, E. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, P. Palazzi, J. Pater, P. Perrodo, J. Pusztaszeri, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmelling, W. Tejessy, I. Tomalin, R. Veenhof, A. Venturi, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadinotwinowska, A. Barres, C. Boyer, A. Falvard, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. Montret, D. Pallin, P. Perret, F. Podlyski, J. Proriol, J. Rossignol, F. Saadi, T. Fearnley, J. Hansen, J. Hansen, J. Hansen, P. Hansen, S. Johnson, B. Nilsson, A. Kyriakis, E. Simopoulou, I. Siotis, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. Brient, P. Bourdon, L. Passalacqua, A. Rouge, M. Rumpf, R. Tanaka, A. Valassi, M. Verderi, H. Videau, D. Candlin, M. Parsons, E. Veitch, E. Focardi, G. Parrini, M. Corden, M. Delfino, C. Georgiopoulos, D. Jaffe, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, M. Pepealtarelli, S. Salomone, P. Colrain, I. Tenhave, I. Knowles, J. Lynch, W. Maitland, W. Morton, C. Raine, P. Reeves, J. Scarr, K. Smith, M. Smith, A. Thompson, S. Thorn, R. Turnbull, U. Becker, O. Braun, C. Geweniger, G. Graefe, P. Hanke, V. Hepp, E. Kluge, A. Putzer, B. Rensch, M. Schmidt, J. Sommer, H. Stenzel, K. Tittel, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, D. Colling, P. Dornan, N. Konstantinidis, L. Moneta, A. Moutoussi, J. Nash, G. Sanmartin, J. Sedgbeer, A. Stacey, G. Dissertori, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, C. Bowdery, T. Brodbeck, A. Finch, F. Foster, G. Hughes, D. Jackson, N. Keemer, M. Nuttall, A. Patel, T. Sloan, S. Snow, E. Whelan, A. Galla, A. Greene, K. Kleinknecht, J. Raab, B. Renk, H. Sander, H. Schmidt, S. Walther, R. Wanke, B. Wolf, J. Aubert, A. Bencheikh, C. Benchouk, A. Bonissent, G. Bujosa, D. Calvet, J. Carr, C. Diaconu, F. Etienne, M. Thulasidas, D. Nicod, P. Payre, D. Rousseau, M. Talby, I. Abt, R. Assmann, C. Bauer, W. Blum, D. Brown, H. Dietl, F. Dydak, C. Gotzhein, A. Halley, K. 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A study of D-asterisk+pi(-)- production in semileptonic B decay

F. Ragusa;
1995

Abstract

In a sample of 1.5 million hadronic decays of the Z collected by the ALEPH detector, a search is carried out for the decays (B) over bar --> D-1(0)(2420)l(-)<(nu)over bar>X and (B) over bar --> D-2(*0)(2460)l(-)<(nu)over bar>X. The product branching ratio for D-1(0) production is measured to be Br(b --> (B) over bar) x Br((B) over bar --> D(1)(0)l(-)<(nu)over bar>X) x Br(D-1(0) --> D-*+ (B) over bar) x Br((B) over bar --> D(2)(*0)l(-)<(nu)over bar>X) x Br(D-2(*0) --> D(*+)pi(-)) less than or equal to less than or equal to 0.81 X 10(-3) is obtained for D-2(*0) production. A topological search sensitive to the processes above, but also to wide resonances that decay to D(*+)pi(-) and to non-resonant D(*+)pi(-) production is also carried out, yielding Br(b--> (B) over bar B) xBr((B) over bar -->D(*+)pi(-) l(-)<(nu)over bar>X>)= (3.7 +/- 1.0(stat) +/- 0.7(syst)) x 10(-3). Direct evidence of D(*)pi production inconsistent with D-1(0) and D-2(*0) in semileptonic B decay is presented.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/176786
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