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B* production in Z decays
Authors
P. Abreu Adam, W. Adye, T. Agasi, E. Ajinenko, I. Aleksan, R. Alekseev, G.D. Allport, P.P. Almehed, S. Alvsvaag, S.J. Amaldi, U. Amato, S. Andreazza, A. Andrieux, M.L. Antilogus, P. Apel, W.-D. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Baudot, J. Becks, K.-H. Begalli, M. Beilliere, P. Belokopytov, Yu. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bigi, M. Bilenky, M.S. Billoir, P. Bloch, D. Blume, M. Blyth, S. Bocci, V. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Bosio, C. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Branchini, P. Brand, K.D. Brenner, R.A. Bricman, C. Brillault, L. Brown, R.C.A. Bruckman, P. Brunet, J.-M. Bugge, L. Buran, T. Buys, A. Caccia, M. Calvi, M. Rozas, A.J.C. Camporesi, T. Canale, V. Canepa, M. Cankocak, K. Cao, F. Carena, F. Carrilho, P. Carroll, L. Caso, C. Gimenez, M.V.C. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chierici, R. Chliapnikov, P. Chochula, P. Chorowicz, V. Cindro, V. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Cossutti, F. Crawley, H.B. Crennell, D. Crosetti, G. Maestro, J.C. Czellar, S. Dahl-Jensen, E. Dahm, J. Dalmagne, B. Dam, M. Damgaard, G. Daum, A. Dauncey, P.D. Davenport, M. Da Silva, W. Defoix, C. Ricca, G.D. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Brabandere, S. De Clercq, C. De La Vaissiere, C. De Lotto, B. De Min, A. De Paula, L. De Saint-Jean, C. Dijkstra, H. Di Ciaccio, L. Djama, F. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Drees, K.A. Dris, M. Dufour, Y. Dupont, F. Edsall, D. Ehret, R. Eigen, G. Ekelof, T. Ekspong, G. Elsing, M. Engel, J.-P. Ershaidat, N. Erzen, B. Santo, M.E. Falk, E. Fassouliotis, D. Feindt, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Formenti, F. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furstenau, H. Fuster, J. Galloni, A. Gamba, D. Gandelman, M. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gele, D. Gele, D. Gerber, J.-P. Gerdyukov, L. Gibbs, M. Gillespie, D. Gokieli, R. Golob, B. Gopal, G. Gorn, L. Gorski, M. Gouz, Yu. Gracco, V. Graziani, E. Grosdidier, G. Gunnarsson, P. Gunther, M. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Hahn, S. Hajduk, Z. Hallgren, A. Hamacher, K. Hao, W. Harris, F.J. Hedberg, V. Henriques, R. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Higon, E. Hilke, H.J. Hill, T.S. Holmgren, S.-O. Holt, P.J. Holthuizen, D. Houlden, M. Hrubec, J. Huet, K. Hultqvist, K. Ioannou, P. Jackson, J.N. Jacobsson, R. Jalocha, P. Janik, R. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Jonsson, L. Jonsson, P. Joram, C. Juillot, P. Kaiser, M. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koehne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korcyl, K. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krammer, M. Kreuter, C. Krolikowski, J. Kronkvist, I. Krumstein, Z. Krupinski, W. Kubinec, P. Kucewicz, W. Kurvinen, K. Lacasta, C. Laktineh, I. Lamblot, S. Lamsa, J.W. Lanceri, L. Lane, D.W. Langefeld, P. Lapin, V. Last, I. Laugier, J.P. Lauhakangas, R. Leder, G. Ledroit, F. Lefebure, V. Legan, C.K. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Liko, D. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez, J.M. Lopez-Fernandez, A. Aguera, M.A.L. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Maehlum, G. Maio, A. Malychev, V. Marco, J. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Maron, T. Martinez-Rivero, C. Martinez-Vidal, F. Marti i Garcia, S. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Cubbin, M.M. Kay, R.Mc. Nulty, R.Mc. Medbo, J. Meroni, C. Meyer, W.T. Michelotto, M. Migliore, E. Mirabito, L. Mitaroff, W.A. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Mundim, L.M. Murray, W.J. Muryn, B. Myatt, G. Naraghi, F. Navarria, F.L. Navas, S. Negri, P. Nemecek, S. Neumann, W. Neumeister, N. Nicolaidou, R. Nielsen, B.S. Nieuwenhuizen, M. Nikolaenko, V. Niss, P. Nomerotski, A. Normand, A. Oberschulte-Beckmann, W. Obraztsov, V. Olshevski, A.G. Orava, R. Osterberg, K. Ouraou, A. Paganini, P. Paganoni, M. Pages, P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Passeri, A. Pegoraro, M. Peralta, L. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Phillips, H.T. Piana, G. Pierre, F. Pimenta, M. Plaszczynski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Pozdniakov, V. Prest, M. Privitera, P. Pukhaeva, N. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Rames, J. Ratoff, P.N. Read, A.L. Reale, M. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, J. Ridky, J. Rinaudo, G. Ripp, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronjin, V. Roos, L. Rosenberg, E.I. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Saarikko, H. Sacquin, Y. Sadovsky, A. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schneider, H. Schyns, M.A.E. Sciolla, G. Scuri, F. Sedykh, Y. Segar, A.M. Seitz, A. Sekulin, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Sitar, B. Skaali, T.B. Smadja, G. Smirnov, N. Smirnova, O. Smith, G.R. Sosnowski, R. Souza-Santos, D. Spassov, T. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavitski, I. Stepaniak, K. Stichelbaut, F. Stocchi, A. Strauss, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Tabarelli, T. Tavernet, J.P. Tchikilev, O. Tilquin, A. Timmermans, J. Tkatchev, L.G. Todorov, T. Toet, D.Z. Tomaradze, A. Tome, B. Tortora, L. Transtromer, G. Treille, D. Trischuk, W. Tristram, G. Trombini, A. Troncon, C. Tsirou, A. Turluer, M.-L. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, B. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Doninck, W.K. Van Eldik, J. Vassilopoulos, N. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wehr, A. Weierstall, M. Weilhammer, P. Wetherell, A.M. Wicke, D. Wickens, J.H. Wielers, M. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yip, K. Yushchenko, O. Zach, F. Zacharatou, C. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zimin, N.I. Zito, M. Zontar, D. Zuberi, R. Zucchelli, G.C. Zumerle, G.
Publication date
1 January 1995
Publisher
Abstract
The decay B*→Bγ has been observed with the DELPHI detector at LEP, where the B* meson is produced in Z boson decays. The combination of inclusively reconstructed B mesons with well-measured converted photons yields a measurement of the flavour-averaged B*-B mass difference of 45.5±0.3 (stat.) ±0.8 (syst.) MeV/c2. 95% confidence level upper limits at 6 MeV/c2 are placed on both the isospin (i.e. B+-B0) and the Bs-Bud splitting of the mass difference. The production ratio of B* to B mesons in Z decays is measured to be 0.72±0.03 (stat.) ±0.06 (syst.). Limits on the production cross-section of other hypothetical excited B hadron states decaying radiatively are established. The differential B* cross section has been measured to be in good agreement with the average b fragmentation, yielding an average fractional B* energy of 〈xE〉=0.695±0.009 (stat.) ±0.013 (syst.). From the decay angular distribution the relative contribution of longitudinal B* polarisation states is measured to be σL/(σL + σT) = 0.32 ± 0.04 (stat.) ±0.03 (syst.). © 1995 Springer-Verlag
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