Two samples of exclusive semileptonic decays, 579 (B) over bar(0) --> D*(+)l(-)(v) over bar(l) events and 261 (B) over bar(0) --> D(+)l(-)(v) over bar(l) events, are selected from approximately 3.9 million hadronic Z decays collected by the ALEPH detector at LEP. From the reconstructed differential decay rate of each sample, the product of the hadronic form factor F(omega) at zero recoil of the D-(*+) meson and the CKM matrix element \V-cb\ are measured to be FD*+(1)\V-cb\ = (31.9 +/- 1.8(stat) +/- 1.9(syst)) x 10(-3), FD+(1)\(V-cb\ = (27.8 +/- 6.8(stat) +/- 6.5(syst)) x 10(-3). The ratio of the form factors FD+(1) and FD*+(1) is measured to be FD+(1)/FD*+(1) = 0.87 +/- 0.22(stat) +/- 0.21(syst). A value of \V-cb\ is extracted from the two samples, using theoretical constraints on the slope and curvature of the hadronic form factors and their normalization at zero recoil, with the result \V-cb\ = (34.4 +/- 1.6(stat)+/- 2.3(syst) +/- 1.4(th)) x 10(-3). The branching fractions are measured from the two integrated spectra to be Br((B) over bar(0) --> D(*+)l(-)(v) over bar(l)) = (5.53 +/- 0.26(stat) +/- 0.52(syst))%, Br((B) over bar(0) --> D(+)l(-)(v) over bar(l)) = (2.35 +/- 0.20(stat) +/- 0.44(syst))%.
Measurements of vertical bar V-cb vertical bar form factors and branching fractions in the decays (B)over-bar(0)->D(*+)l(-)(nu)over-bar(l) and (B)over-bar(0)->D(+)l(-)(nu)over-bar(l) / D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. Lees, A. Lucotte, M. Minard, J. Nief, P. Odier, B. Pietrzyk, M. Casado, M. Chmeissani, P. Comas, J. Crespo, M. Delfino, I. Efthymiopoulos, E. Fernandez, M. FernandezBosman, L. Garrido, A. Juste, M. Martinez, S. Orteu, C. Padilla, I. Park, A. Pascual, J. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. dePalma, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, R. Alemany, A. Bazarko, P. BrightThomas, M. Cattaneo, F. Cerutti, P. Coyle, H. Drevermann, R. Forty, M. Frank, R. Hagelberg, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, G. Lutters, P. Mato, A. Minten, R. Miquel, L. Mir, L. Moneta, T. Oest, A. Pacheco, J. Pusztaszeri, F. Ranjard, P. Rensing, G. Rizzo, L. Rolandi, D. Schlatter, M. Schmelling, M. Schmitt, O. Schneider, W. Tejessy, I. Tomalin, A. Venturi, H. Wachsmuth, A. Wagner, Z. Ajaltouni, 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, P. Rosnet, J. Rossignol, T. Fearnley, J. Hansen, J. Hansen, J. Hansen, P. Hansen, B. Nilsson, B. Rensch, A. Waananen, A. Kyriakis, C. Markou, E. Simopoulou, I. Siotis, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. Brient, P. Bourdon, A. Rouge, M. Rumpf, A. Valassi, M. Verderi, H. Videau, D. Candlin, M. Parsons, E. Focardi, G. Parrini, M. Corden, C. Georgiopoulos, D. Jaffe, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, D. Casper, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, L. Passalacqua, M. PepeAltarelli, L. Curtis, S. Dorris, A. Halley, I. Knowles, J. Lynch, V. OShea, C. Raine, J. Scarr, K. Smith, P. TeixeiraDias, A. Thompson, E. Thomson, F. Thomson, R. Turnbull, U. Becker, C. Geweniger, G. Graefe, P. Hanke, G. Hansper, V. Hepp, E. Kluge, A. Putzer, M. Schmidt, J. Sommer, H. Stenzel, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, P. Dornan, E. Martin, A. Moutoussi, J. Nash, J. Sedgbeer, A. Stacey, M. Williams, G. Dissertori, P. Girtler, D. Kuhn, G. Rudolph, A. Betteridge, C. Bowdery, P. Colrain, G. Crawford, A. Finch, F. Foster, G. Hughes, T. Sloan, M. Williams, A. Galla, I. Giehl, A. Greene, C. Hoffmann, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H. Sander, P. vanGemmeren, C. Zeitnitz, J. Aubert, A. Bencheikh, C. Benchouk, A. Bonissent, G. Bujosa, D. Calvet, J. Carr, C. Diaconu, F. Etienne, N. Konstantinidis, P. Payre, D. Rousseau, M. Talby, A. Sadouki, M. Thulasidas, K. Trabelsi, M.R.A. Aleppo, F. Ragusa, R. Berlich, W. Blum, V. Buscher, H. Dietl, F. Dydak, G. Ganis, C. Gotzhein, H. Kroha, G. Lutjens, G. Lutz, W. Manner, H. Moser, R. Richter, A. RosadoSchlosser, S. Schael, R. Settles, H. Seywerd, R. StDenis, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, Y. Choi, A. Cordier, M. Davier, L. Duflot, J. Grivaz, P. Heusse, A. Hocker, A. Jacholkowska, M. Jacquet, D. Kim, F. LeDiberder, J. Lefrancois, A. Lutz, I. Nikolic, H. Park, M. Schune, S. Simion, J. Veillet, I. Videau, D. Zerwas, P. Azzurri, G. Bagliesi, G. Batignani, S. Bettarini, C. Bozzi, G. Calderini, M. Carpinelli, M. Ciocci, V. Ciulli, R. DellOrso, R. Fantechi, I. Ferrante, L. Foa, F. Forti, A. Giassi, M. Giorgi, A. Gregorio, F. Ligabue, A. Lusiani, P. Marrocchesi, A. Messineo, F. Palla, G. Sanguinetti, A. Sciaba, P. Spagnolo, J. Steinberger, R. Tenchini, G. Tonelli, C. Vannini, P. Verdini, G. Blair, L. Bryant, J. Chambers, Y. Gao, M. Green, T. Medcalf, P. Perrodo, J. Strong, J. vonWimmerspergToeller, D. Botterill, R. Cliff, T. Edgecock, S. Haywood, P. Maley, P. Norton, J. Thompson, A. Wright, B. BlochDevaux, P. Colas, S. Emery, W. Kozanecki, E. Lancon, M. Lemaire, E. Locci, P. Perez, J. Rander, J. Renardy, A. Roussarie, J. Schuller, J. Schwindling, A. Trabelsi, B. Vallage, S. Black, J. Dann, R. Johnson, H. Kim, A. Litke, M. McNeil, G. Taylor, C. Booth, R. Boswell, C. Brew, S. Cartwright, F. Combley, A. Koksal, M. Letho, W. Newton, J. Reeve, L. Thompson, A. Bohrer, S. Brandt, G. Cowan, C. Grupen, J. MinguetRodriguez, F. Rivera, P. Saraiva, L. Smolik, F. Stephan, M. Apollonio, L. Bosisio, R. DellaMarina, G. Giannini, B. Gobbo, G. Musolino, J. Rothberg, S. Wasserbaech, S. Armstrong, P. Elmer, Z. Feng, D. Ferguson, Y. Gao, S. Gonzalez, J. Grahl, T. Greening, O. Hayes, H. Hu, P. McNamara, J. Nachtman, W. Orejudos, Y. Pan, Y. Saadi, I. Scott, A. Walsh, J. Walsh, S. Wu, X. Wu, J. Yamartino, M. Zheng, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 395:3/4(1997), pp. 373-387. [10.1016/S0370-2693(97)00071-3]
Measurements of vertical bar V-cb vertical bar form factors and branching fractions in the decays (B)over-bar(0)->D(*+)l(-)(nu)over-bar(l) and (B)over-bar(0)->D(+)l(-)(nu)over-bar(l)
M.R.A. Aleppo;F. Ragusa;
1997
Abstract
Two samples of exclusive semileptonic decays, 579 (B) over bar(0) --> D*(+)l(-)(v) over bar(l) events and 261 (B) over bar(0) --> D(+)l(-)(v) over bar(l) events, are selected from approximately 3.9 million hadronic Z decays collected by the ALEPH detector at LEP. From the reconstructed differential decay rate of each sample, the product of the hadronic form factor F(omega) at zero recoil of the D-(*+) meson and the CKM matrix element \V-cb\ are measured to be FD*+(1)\V-cb\ = (31.9 +/- 1.8(stat) +/- 1.9(syst)) x 10(-3), FD+(1)\(V-cb\ = (27.8 +/- 6.8(stat) +/- 6.5(syst)) x 10(-3). The ratio of the form factors FD+(1) and FD*+(1) is measured to be FD+(1)/FD*+(1) = 0.87 +/- 0.22(stat) +/- 0.21(syst). A value of \V-cb\ is extracted from the two samples, using theoretical constraints on the slope and curvature of the hadronic form factors and their normalization at zero recoil, with the result \V-cb\ = (34.4 +/- 1.6(stat)+/- 2.3(syst) +/- 1.4(th)) x 10(-3). The branching fractions are measured from the two integrated spectra to be Br((B) over bar(0) --> D(*+)l(-)(v) over bar(l)) = (5.53 +/- 0.26(stat) +/- 0.52(syst))%, Br((B) over bar(0) --> D(+)l(-)(v) over bar(l)) = (2.35 +/- 0.20(stat) +/- 0.44(syst))%.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
