A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227 +/- 140 +/- 252 B* mesons in the decay B* --> B gamma and 1944 +/- 108 +/- 161 B-u,B-d** mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B-u,B-d** denotes the eight L = 1 (b (u) over bar and (b (d) over bar) states and their charge conjugate. For the well established B* meson the following quantities are obtained: Delta M = M(B)* - M(B) = (45.30 +/- 0.35 +/- 0.87) MeV/c(2) and N-B*/(N-B + N-B*) = (77.1 +/- 2.6 +/- 7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be sigma(L)/(sigma(L) + sigma(T)) = (33 +/- 6 +/- 5)%. In the M(B pi)- M(B) mass difference resonance structure is observed at (424 +/- 4 +/- 10) MeV/c(2), for which the shape and position is consistent with the expectation for B-u,B-d** states decaying into B(*)pi(+/-). The relative production rate is determined to be BR(Z --> b --> B-u,B-d**)/BR(Z --> b --> B-u,B-d) = [27.9 +/- 1.6(stat) +/- 5.9(syst) (+3.9)(-5.6)(model)]%. where the third error reflects the uncertainty due to different production and decay models for the broad B-u,B-d** States.
Production of excited beauty states in Z decays / D. Buskulic, D. Casper, I. DeBonis, D. Decamp, P. Ghez, C. Goy, J. Lees, A. Lucotte, 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, A. Colaleo, D. Creanza, M. dePalma, A. Farilla, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. 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, R. Hagelberg, J. Harvey, R. Jacobsen, P. Janot, B. Jost, J. Knobloch, I. Lehraus, C. Markou, E. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, T. Oest, P. Palazzi, J. Pater, J. Pusztaszeri, F. Ranjard, P. Rensing, L. Rolandi, D. Schlatter, M. Schmelling, O. Schneider, W. Tejessy, I. Tomalin, 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, 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. Focardi, G. Parrini, M. Corden, M. Delfino, C. Georgiopoulos, D. Jaffe, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, M. PepeAltarelli, S. Dorris, A. Halley, I. tenHave, I. Knowles, J. Lynch, W. Morton, V. OShea, C. Raine, P. Reeves, J. Scarr, K. Smith, M. Smith, A. Thompson, F. Thomson, 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, S. Werner, 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, P. Colrain, G. Crawford, A. Finch, F. Foster, G. Hughes, T. Sloan, E. Whelan, M. Williams, A. Galla, A. Greene, K. Kleinknecht, G. Quast, J. Raab, B. Renk, H. Sander, P. Wanke, C. Zeitnitz, 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, G. Ganis, C. Gotzhein, K. Jakobs, H. Kroha, G. Lutjens, G. Lutz, W. Manner, H. Moser, R. Richter, A. RosadoSchlosser, S. Schael, R. Settles, H. Seywerd, U. Stierlin, R. StDenis, G. Wolf, R. Alemany, J. Boucrot, O. Callot, A. Cordier, F. Courault, M. Davier, L. Duflot, J. Grivaz, P. Heusse, M. Jacquet, D. Kim, F. LeDiberder, J. Lefranois, A. Lutz, G. Musolino, I. Nikolic, H. Park, I. Park, M. Schune, S. Simion, J. Veillet, I. Videau, D. Abbaneo, 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, G. Rizzo, G. Sanguinetti, A. Sciaba, P. Spagnolo, J. Steinberger, R. Tenchini, G. Tonelli, G. Triggiani, C. Vannini, P. Verdini, J. Walsh, A. Betteridge, G. Blair, L. Bryant, F. Cerutti, Y. Gao, M. Green, D. Johnson, T. Medcalf, L. Mir, P. Perrodo, J. Strong, V. Bertin, D. Botterill, R. Clifft, T. Edgecock, S. Haywood, M. Edwards, P. Maley, P. Norton, J. Thompson, B. BlochDevaux, P. Colas, H. Duarte, S. Emery, W. Kozanecki, E. Lancon, M. Lemaire, E. Locci, B. Marx, P. Perez, J. Rander, J. Renardy, A. Rosowsky, A. Roussarie, J. Schuller, J. Schwindling, D. Mohand, A. Trabelsi, B. Vallage, R. Johnson, H. Kim, A. Litke, M. McNeil, G. Taylor, A. Beddall, C. Booth, R. Boswell, S. Cartwright, F. Combley, I. Dawson, A. Koksal, M. Letho, W. Newton, C. Rankin, L. Thompson, A. Bohrer, S. Brandt, G. Cowan, E. Feigl, C. Grupen, G. Lutters, J. MinguetRodriguez, F. Rivera, P. Saraiva, L. Smolik, F. Stephan, P. vanGemmeren, M. Apollonio, L. Bosisio, R. DellaMarina, G. Giannini, B. Gobbo, F. Ragusa, J. Rothberg, S. Wasserbaech, S. Armstrong, L. Bellantoni, P. Elmer, Z. Feng, D. Ferguson, Y. Gao, S. Gonzalez, J. Grahl, J. Harton, O. Hayes, H. Hu, P. McNamara, J. Nachtman, W. Orejudos, Y. Pan, Y. Saadi, M. Schmitt, I. Scott, V. Sharma, J. Turk, A. Walsh, S. Wu, X. Wu, J. Yamartino, M. Zheng, G. Zobernig. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - 69:3(1996), pp. 393-404. [10.1007/s002880050039]
Production of excited beauty states in Z decays
F. Ragusa;
1996
Abstract
A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227 +/- 140 +/- 252 B* mesons in the decay B* --> B gamma and 1944 +/- 108 +/- 161 B-u,B-d** mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B-u,B-d** denotes the eight L = 1 (b (u) over bar and (b (d) over bar) states and their charge conjugate. For the well established B* meson the following quantities are obtained: Delta M = M(B)* - M(B) = (45.30 +/- 0.35 +/- 0.87) MeV/c(2) and N-B*/(N-B + N-B*) = (77.1 +/- 2.6 +/- 7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be sigma(L)/(sigma(L) + sigma(T)) = (33 +/- 6 +/- 5)%. In the M(B pi)- M(B) mass difference resonance structure is observed at (424 +/- 4 +/- 10) MeV/c(2), for which the shape and position is consistent with the expectation for B-u,B-d** states decaying into B(*)pi(+/-). The relative production rate is determined to be BR(Z --> b --> B-u,B-d**)/BR(Z --> b --> B-u,B-d) = [27.9 +/- 1.6(stat) +/- 5.9(syst) (+3.9)(-5.6)(model)]%. where the third error reflects the uncertainty due to different production and decay models for the broad B-u,B-d** States.
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