Article

Measurement of the spectroscopy of orbitally excited B mesons at LEP

M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M.G. Alviggi, G. Ambrosi, H. Anderhub, V.P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, T. Aziz, P. Bagnaia, L. Baksay, A. Balandras, R.C. Ball, S. Banerjee, Sw. Banerjee, A. Barczyk, R. Barillère, L. Barone, P. Bartalini, M. Basile, R. Battiston, A. Bay, F. Becattini, U. Becker, F. Behner, L. Bellucci, J. Berdugo, P. Berges, B. Bertucci, B.L. Betev, S. Bhattacharya, M. Biasini, A. Biland, J.J. Blaising, S.C. Blyth, G.J. Bobbink, A. Böhm, L. Boldizsar, B. Borgia, D. Bourilkov, M. Bourquin, S. Braccini, J.G. Branson, V. Brigljevic, F. Brochu, A. Buffini, A. Buijs, J.D. Burger, W.J. Burger, J. Busenitz, A. Button, X.D. Cai, M. Campanelli, M. Capell, G. Cara Romeo, G. Carlino, A.M. Cartacci, J. Casaus, G. Castellini, F. Cavallari, N. Cavallo, C. Cecchi, M. Cerrada, F. Cesaroni, M. Chamizo, Y.H. Chang, U.K. Chaturvedi, M. Chemarin, A. Chen, G. Chen, G.M. Chen, H.F. Chen, H.S. Chen, X. Chereau, G. Chiefari, L. Cifarelli, F. Cindolo, C. Civinini, I. Clare, R. Clare, G. Coignet, A.P. Colijn, N. Colino, S. Costantini, F. Cotorobai, B. Cozzoni, B. de la Cruz, A. Csilling, S. Cucciarelli, T.S. Dai, J.A. van Dalen, R. D'Alessandro, R. de Asmundis, P. Déglon, A. Degré, K. Deiters, D. della Volpe, P. Denes, F. DeNotaristefani, A. De Salvo, M. Diemoz, D. van Dierendonck, F. Di Lodovico, C. Dionisi, M. Dittmar, A. Dominguez, A. Doria, M.T. Dova, D. Duchesneau, D. Dufournand, P. Duinker, I. Duran, H. El Mamouni, A. Engler, F.J. Eppling, F.C. Erné, P. Extermann, M. Fabre, R. Faccini, M.A. Falagan, S. Falciano, A. Favara, J. Fay, O. Fedin, M. Felcini, T. Ferguson, F. Ferroni, H. Fesefeldt, E. Fiandrini, J.H. Field, F. Filthaut, P.H. Fisher, I. Fisk, G. Forconi, L. Fredj, K. Freudenreich, C. Furetta, M. Gailloud, Yu. Galaktionov, S.N. Ganguli, P. Garcia-Abia, M. Gataullin, S.S. Gau, S. Gentile, N. Gheordanescu, S. Giagu, S. Goldfarb, Z.F. Gong, G. Grenier, O. Grimm, M.W. Gruenewald, M. Guida, R. van Gulik, V.K. Gupta, A. Gurtu, L.J. Gutay, D. Haas, A. Hasan, D. Hatzifotiadou, T. Hebbeker, A. Hervé, P. Hidas, J. Hirschfelder, H. Hofer, G. Holzner, H. Hoorani, S.R. Hou, I. Iashvili, B.N. Jin, L.W. Jones, P. de Jong, I. Josa-Mutuberrı́a, R.A. Khan, D. Kamrad, A. Kasser, M. Kaur, M.N. Kienzle-Focacci, D. Kim, D.H. Kim, J.K. Kim, S.C. Kim, J. Kirkby, D. Kiss, W. Kittel, A. Klimentov, A.C. König, A. Kopp, I. Korolko, V. Koutsenko, M. Kräber, R.W. Kraemer, W. Krenz, A. Kunin, P. Ladron de Guevara, I. Laktineh, G. Landi, K. Lassila-Perini, P. Laurikainen, A. Lavorato, M. Lebeau, A. Lebedev, P. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, H.J. Lee, J.M. Le Goff, R. Leiste, E. Leonardi, P. Levtchenko, C. Li, C.H. Lin, W.T. Lin, F.L. Linde, L. Lista, Z.A. Liu, W. Lohmann, E. Longo, Y.S. Lu, K. Lübelsmeyer, C. Luci, D. Luckey, L. Lugnier, L. Luminari, W. Lustermann, W.G. Ma, M. Maity, L. Malgeri, A. Malinin, C. Maña, D. Mangeol, P. Marchesini, G. Marian, J.P. Martin, F. Marzano, G.G.G. Massaro, K. Mazumdar, R.R. McNeil, S. Mele, L. Merola, M. Meschini, W.J. Metzger, M. von der Mey, Y. Mi, A. Mihul, H. Milcent, G. Mirabelli, J. Mnich, G.B. Mohanty, P. Molnar, B. Monteleoni, T. Moulik, G.S. Muanza, F. Muheim, A.J.M. Muijs, M. Musy, M. Napolitano, F. Nessi-Tedaldi, H. Newman, T. Niessen, A. Nippe, A. Nisati, H. Nowak, Y.D. Oh, G. Organtini, R. Ostonen, C. Palomares, D. Pandoulas, S. Paoletti, P. Paolucci, R. Paramatti, H.K. Park, I.H. Park, G. Pascale, G. Passaleva, S. Patricelli, T. Paul, M. Pauluzzi, C. Paus, F. Pauss, D. Peach, M. Pedace, S. Pensotti, D. Perret-Gallix, B. Petersen, D. Piccolo, F. Pierella, M. Pieri, P.A. Piroué, E. Pistolesi, V. Plyaskin, M. Pohl, V. Pojidaev, H. Postema, J. Pothier, N. Produit, D.O. Prokofiev, D. Prokofiev, J. Quartieri, G. Rahal-Callot, M.A. Rahaman, P. Raics, N. Raja, R. Ramelli, P.G. Rancoita, G. Raven, P. Razis, D. Ren, M. Rescigno, S. Reucroft, T. van Rhee, S. Riemann, K. Riles, A. Robohm, J. Rodin, B.P. Roe, L. Romero, A. Rosca, S. Rosier-Lees, Ph. Rosselet, J.A. Rubio, D. Ruschmeier, H. Rykaczewski, S. Sarkar, J. Salicio, E. Sanchez, M.P. Sanders, M.E. Sarakinos, C. Schäfer, V. Schegelsky, S. Schmidt-Kaerst, D. Schmitz, H. Schopper, D.J. Schotanus, G. Schwering, C. Sciacca, D. Sciarrino, A. Seganti, L. Servoli, S. Shevchenko, N. Shivarov, V. Shoutko, E. Shumilov, A. Shvorob, T. Siedenburg, D. Son, B. Smith, P. Spillantini, M. Steuer, D.P. Stickland, A. Stone, H. Stone, B. Stoyanov, A. Straessner, K. Sudhakar, G. Sultanov, L.Z. Sun, H. Suter, J.D. Swain, Z. Szillasi, T. Sztaricshai, X.W. Tang, L. Tauscher, L. Taylor, C. Timmermans, Samuel C.C. Ting, S.M. Ting, S.C. Tonwar, J. Tóth, C. Tully, K.L. Tung, Y. Uchida, J. Ulbricht, E. Valente, G. Vesztergombi, I. Vetlitsky, D. Vicinanza, G. Viertel, S. Villa, M. Vivargent, S. Vlachos, I. Vodopianov, H. Vogel, H. Vogt, I. Vorobiev, A.A. Vorobyov, A. Vorvolakos, M. Wadhwa, W. Wallraff, M. Wang, X.L. Wang, Z.M. Wang, A. Weber, M. Weber, P. Wienemann, H. Wilkens, S.X. Wu, S. Wynhoff, L. Xia, Z.Z. Xu, B.Z. Yang, C.G. Yang, H.J. Yang, M. Yang, J.B. Ye, S.C. Yeh, An. Zalite, Yu. Zalite, Z.P. Zhang, G.Y. Zhu, R.Y. Zhu, A. Zichichi, F. Ziegler, G. Zilizi, M. Zöller

I. Physikalisches Institut, RWTH, D-52056 Aachen, Germany, and III. Physikalisches Institut, RWTH, D-52056 Aachen, Germany5Supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie.5; National Institute for High Energy Physics, NIKHEF, and University of Amsterdam, NL-1009 DB Amsterdam, The Netherlands; University of Michigan, Ann Arbor, MI 48109, USA; Laboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, France; Institute of Physics, University of Basel, CH-4056 Basel, Switzerland; Louisiana State University, Baton Rouge, LA 70803, USA; Institute of High Energy Physics, IHEP, 100039 Beijing, China6Supported by the National Natural Science Foundation of China.6; Humboldt University, D-10099 Berlin, Germany5; University of Bologna and INFN-Sezione di Bologna, I-40126 Bologna, Italy; Tata Institute of Fundamental Research, Bombay 400 005, India; Northeastern University, Boston, MA 02115, USA; Institute of Atomic Physics and University of Bucharest, R-76900 Bucharest, Romania; Central Research Institute for Physics of the Hungarian Academy of Sciences, H-1525 Budapest 114, Hungary7Supported by the Hungarian OTKA fund under contract numbers T019181, F023259 and T024011.7; Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Lajos Kossuth University-ATOMKI, H-4010 Debrecen, Hungary4; INFN Sezione di Firenze and University of Florence, I-50125 Florence, Italy; European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland; World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland; University of Geneva, CH-1211 Geneva 4, Switzerland; Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China6; SEFT, Research Institute for High Energy Physics, P.O. Box 9, SF-00014 Helsinki, Finland; University of Lausanne, CH-1015 Lausanne, Switzerland; INFN-Sezione di Lecce and Universitá Degli Studi di Lecce, I-73100 Lecce, Italy; Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Claude Bernard, F-69622 Villeurbanne, France; Centro de Investigaciones Energéticas, Medioambientales y Tecnologı́cas, CIEMAT, E-28040 Madrid, Spain8Supported also by the Comisión Interministerial de Ciencia y Tecnologı́a.8; INFN-Sezione di Milano, I-20133 Milan, Italy; Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia; INFN-Sezione di Napoli and University of Naples, I-80125 Naples, Italy; Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus; University of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The Netherlands; California Institute of Technology, Pasadena, CA 91125, USA; INFN-Sezione di Perugia and Universitá Degli Studi di Perugia, I-06100 Perugia, Italy; Carnegie Mellon University, Pittsburgh, PA 15213, USA; Princeton University, Princeton, NJ 08544, USA; INFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, Italy; Nuclear Physics Institute, St. Petersburg, Russia; University and INFN, Salerno, I-84100 Salerno, Italy; University of California, San Diego, CA 92093, USA; Dept. de Fisica de Particulas Elementales, Univ. de Santiago, E-15706 Santiago de Compostela, Spain; Bulgarian Academy of Sciences, Central Lab. of Mechatronics and Instrumentation, BU-1113 Sofia, Bulgaria; Center for High Energy Physics, Adv. Inst. of Sciences and Technology, 305-701 Taejon, South Korea; University of Alabama, Tuscaloosa, AL 35486, USA; Utrecht University and NIKHEF, NL-3584 CB Utrecht, The Netherlands; Purdue University, West Lafayette, IN 47907, USA; Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland; DESY, D-15738 Zeuthen, Germany; Eidgenössische Technische Hochschule, ETH Zürich, CH-8093 Zürich, Switzerland; University of Hamburg, D-22761 Hamburg, Germany; National Central University, Chung-Li, Taiwan, ROC; Department of Physics, National Tsing Hua University, Taiwan, ROC
Physics Letters B DOI:10.1016/S0370-2693(99)01067-9 pp.323-334

ABSTRACT We measure the masses, decay widths and relative production rate of orbitally excited B mesons using 1.25 million hadronic Z decays recorded by the L3 detector. B-meson candidates are inclusively reconstructed and combined with charged pions produced at the primary event vertex. An excess of events above the expected background in the Bπ mass spectrum in the region 5.6–5.8 GeV is interpreted as resulting from the decay , where denotes a mixture of l=1 B-meson states containing a u or a d quark. A fit to the mass spectrum yields the masses and decay widths of the and spin states, as well as the branching fraction for the combination of l=1 states. In addition, evidence is presented for the existence of an excited B-meson state or mixture of states in the region 5.9–6.0 GeV.

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Keywords

1.25 million hadronic Z decays
 
B mesons
 
B-meson candidates
 
branching fraction
 
Bπ mass spectrum
 
d quark
 
events
 
excited B-meson state
 
expected background
 
mass spectrum yields
 
masses
 
orbitally
 
pions
 
primary event vertex
 
relative production rate
 
states