Resonant structure and flavour tagging in the Bπ± system using fully reconstructed B decays

被引:52
作者
Barate, R [1 ]
Buskulic, D
Decamp, D
Ghez, P
Goy, C
Lees, JP
Lucotte, A
Merle, E
Minard, MN
Nief, JY
Pietrzyk, B
Alemany, R
Boix, G
Casado, MP
Chmeissani, M
Crespo, JM
Delfino, M
Fernandez, E
Fernandez-Bosman, M
Garrido, L
Grauges, E
Juste, A
Martinez, M
Merino, G
Miquel, R
Mir, LM
Park, IC
Pascual, A
Perlas, JA
Riu, I
Sanchez, F
Colaleo, A
Creanza, D
de Palma, M
Gelao, G
Iaselli, G
Maggi, G
Maggi, M
Nuzzo, S
Ranieri, A
Raso, G
Ruggieri, F
Selvaggi, G
Silvestris, L
Tempesta, P
Tricomi, A
Zito, G
Huang, X
Lin, J
Ouyang, Q
机构
[1] CNRS, IN2P3, Phys Particules Lab, F-74019 Annecy Le Vieux, France
[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, Bellaterra 08193, Barcelona, Spain
[3] Ist Nazl Fis Nucl, Sez Bari, Dipartimento Fis, I-70126 Bari, Italy
[4] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China
[5] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland
[6] Univ Clermont Ferrand, CNRS, IN2P3, Phys Corpusculaire Lab, F-63177 Aubiere, France
[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[8] Democritos Nucl Res Ctr, Athens, Greece
[9] Ecole Polytech, Lab Phys Nucl & Hautes Energies, IN2P3, CNRS, F-91128 Palaiseau, France
[10] Univ Florence, Dipartimento Fis, INFN, Sez Firenze, I-50125 Florence, Italy
[11] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA
[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[13] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[14] Univ Heidelberg, Inst Hochenergiephys, D-69120 Heidelberg, Germany
[15] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England
[16] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria
[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[18] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[19] Fac Sci Luminy, Ctr Phys Particules, IN2P3, CNRS, F-13288 Marseille, France
[20] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[21] INFN, Sez Milano, I-20133 Milan, Italy
[22] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst Phys, D-80805 Munich, Germany
[23] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, F-91405 Orsay, France
[24] Univ Pisa, Dipartimento Fis, INFN, Sez Pisa, I-56010 Pisa, Italy
[25] Scuola Normale Super Pisa, I-56010 Pisa, Italy
[26] Univ London Royal Holloway & Bedford New Coll, Dept Phys, Egham TW20 0EX, Surrey, England
[27] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England
[28] Ctr Etud Saclay, CEA, DAPNIA, Serv Phys Particules, F-91191 Gif Sur Yvette, France
[29] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA
[30] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England
[31] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
[32] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy
[33] INFN, Sez Trieste, I-34127 Trieste, Italy
[34] Univ Washington, Seattle, WA 98195 USA
[35] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[36] Univ Barcelona, Barcelona 08208, Spain
[37] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Catania, I-95129 Catania, Italy
[38] Univ Turin, Ist Fis Gen, Turin, Italy
[39] CNR, Ist Cosmogeofis, I-10133 Turin, Italy
[40] CERN, CH-1211 Geneva 23, Switzerland
[41] Univ Sassari, Ist Matemat & Fis, I-07100 Sassari, Italy
[42] Kangnung Natl Univ, Kangnung, South Korea
关键词
D O I
10.1016/S0370-2693(98)00180-4
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Starting from a sample of four million hadronic Z decays collected with the ALEPH detector at LEP, 404 charged and neutral B mesons are fully reconstructed and used to look for resonant structure in the B pi. system. An excess of events is observed above the expected background in the B rr mass spectrum at a mass approximate to 5.7 GeV/c(2), consistent with the production and decay to B(*)pi of the B** states predicted by Heavy Quark Symmetry (HQS). In the framework of HQS, it is found that the mass of the B-2* State is (5739(-11)(+8)(stat)(-4)(+6)(syst))MeV/c(2) 2 and the relative production rate of the B * * system is BR(b --> B** --> B(*)pi)/BR(b --> Bu,d)= (31 +/- 9(stat)(-5)(+6)(syst))%. In the same sample of B mesons, significant B pi(+/-) charge-flavour correlations are observed, which may prove important for tagging the initial B state in future CP violation studies. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:215 / 226
页数:12
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