Search for B-c meson in hadronic Z decays

被引：33

作者：

Barate, R

Buskulic, D

Decamp, D

Ghez, P

Goy, C

Lees, JP

Lucotte, A

Minard, MN

Nief, JY

Pietrzyk, B

Casado, MP

Chmeissani, M

Comas, P

Crespo, JM

Delfino, M

Fernandez, E

FernandezBosman, M

Garrido, L

Juste, A

Martinez, M

Miquel, R

Mir, LM

Orteu, S

Padilla, C

Park, IC

Pascual, A

Perlas, JA

Riu, I

Sanchez, F

Teubert, F

Colaleo, A

Creanza, D

dePalma, M

Gelao, G

Iaselli, G

Maggi, G

Maggi, M

Marinelli, N

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] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, BELLATERRA 08193, BARCELONA, SPAIN

[2] IST NAZL FIS NUCL, DIPARTIMENTO FIS, SEZ BARI, I-70126 BARI, ITALY

[3] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[4] CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[5] UNIV CLERMONT FERRAND, CNRS, IN2P3, PHYS CORPUSCULAIRE LAB, F-63177 CLERMONT FERRAND, FRANCE

[6] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

[8] ECOLE POLYTECH, CNRS, IN2P3, PHYS NUCL & HAUTES ENERGIES LAB, F-91128 PALAISEAU, FRANCE

[9] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND

[10] UNIV FLORENCE, IST NAZL FIS NUCL, SEZ FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY

[11] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[12] IST NAZL FIS NUCL, LAB NAZL FRASCATI, LAB NAZL, 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] UNIV MAINZ, INST PHYS, D-55099 MAINZ, GERMANY

[19] FAC SCI LUMINY, CNRS, IN2P3, PHYS PARTICULES CTR, F-13288 MARSEILLE, FRANCE

[20] UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY

[21] IST NAZL FIS NUCL, I-20133 MILAN, ITALY

[22] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST PHYS, D-80805 MUNICH, GERMANY

[23] UNIV PARIS 11, CNRS, IN2P3, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE

[24] UNIV PISA, DIPARTIMENTO FIS, IST NAZL FIS NUCL, 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, SURREY TW20 OEX, ENGLAND

[27] RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND

[28] CEA, DAPNIA, SERV PARTICULES PHYS, CE SACLAY, 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 GESAMTHSCH SIEGEN, FACHBEREICH PHYS, D-57068 SIEGEN, GERMANY

[32] UNIV TRIESTE, DIPARTMENTO FIS, I-34127 TRIESTE, ITALY

[33] IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[34] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[35] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

来源：

PHYSICS LETTERS B | 1997年 / 402卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(97)00461-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for the B-c meson decaying into the channels J/psi pi(+) and J/psi l(+)nu(l) (l = e or mu) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and 0.81 background events are expected. The following 90% confidence level upper limits are derived: Br(Z --> BcX)/Br(Z --> q (q) over bar BR(B-c(+) --> J/psi pi(+)) < 3.6 x 10(-5), Br(Z --> BcX)/Br(Z-->q (q) over bar)Br(B-c(+) --> J/psi l(+)nu) < 5.2 x 10(-5). Another B-c(+) --> J/psi(e(+)e(-))mu(+)nu(mu) candidate with very low background probability, found in an independent analysis, is also described in detail. (C) 1997 Published by Elsevier Science B.V.

引用

页码：213 / 226

页数：14

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