Search for the B-c meson

被引：36

作者：

Abreu, P

Adam, W

Adye, T

Ajinenko, I

Alekseev, GD

Alemany, R

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Andreazza, A

Andrieux, ML

Antilogus, P

Apel, WD

Asman, B

Augustin, JE

Agustinus, A

Baillon, P

Bambade, P

Barao, F

Barbi, M

Barbiellini, G

Bardin, DY

Barker, G

Baroncelli, A

Barring, O

Barrio, JA

Bartl, W

Bates, MJ

Battaglia, M

Baubillier, M

Baudot, J

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Belous, K

Benvenuti, AC

Berggren, M

Bertini, D

Bertrand, D

Besancon, M

Bianchi, F

Bigi, M

Bilenky, MS

Billoir, P

Bizouard, MA

Bloch, D

Blume, M

Bolognese, T

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011

[2] UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM

[3] FREE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM

[4] UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM

[5] UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE

[6] UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY

[7] UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY

[8] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

[9] CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL

[10] PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL

[11] UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL

[12] COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA

[13] COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE

[14] CERN,CH-1211 GENEVA 23,SWITZERLAND

[15] UNIV STRASBOURG 1,CTR RECH NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE

[16] NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE

[17] CAS,FZU,INST PHYS,DIV HIGH ENERGY PHYS,PRAGUE 18040 8,CZECH REPUBLIC

[18] UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY

[19] IST NAZL FIS NUCL,I-16146 GENOA,ITALY

[20] UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 ST MARTIN DHER,FRANCE

[21] SEFT,RES INST HIGH ENERGY PHYS,FIN-00014 HELSINKI,FINLAND

[22] JOINT INST NUCL RES DUBNA,MOSCOW 101000,RUSSIA

[23] UNIV KARLSRUHE,INST EXPT KERNPHYS,D-76128 KARLSRUHE,GERMANY

[24] INST NUCL PHYS,PL-30055 KRAKOW,POLAND

[25] UNIV MIN & MET KRAKOW,PL-30055 KRAKOW,POLAND

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

[27] UNIV LANCASTER,SCH PHYS & CHEM,LANCASTER LA1 4YB,ENGLAND

[28] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND

[29] UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE

[30] UNIV PARIS 07,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE

[31] LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN

[32] UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE

[33] UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN

[34] UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE

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

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

[37] NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK

[38] CHARLES UNIV,NC,NUCL CTR MFF,AREA MFF,PRAGUE 18000 8,CZECH REPUBLIC

[39] NIKHEF H,NL-1009 DB AMSTERDAM,NETHERLANDS

[40] NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE

[41] UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY

[42] UNIV OVIEDO,DEPT FIS,E-33007 OVIEDO,SPAIN

[43] UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND

[44] UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY

[45] IST NAZL FIS NUCL,I-35131 PADUA,ITALY

[46] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[47] UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY

[48] UNIV ROMA TOR VERGATA,IST NAZL FIS NUCL,I-00173 ROME,ITALY

[49] CENS,CEA,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE

[50] IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY

来源：

PHYSICS LETTERS B | 1997年 / 398卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(97)00254-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a sample of 3.02 million hadronic Z(0) decays collected by the DELPHI detector, 270 J/psi --> e(+)e(-) candidates have been selected. A search for fully reconstructed B-c(+/-) mesons has yielded one B-c(+/-) --> J/psi pi(+/-) candidate, no B-c(+/-) --> J/psi e(+/-) nu(e) candidates, and one B-c(+/-) --> J/psi pi(+)pi(-)pi(+) candidate, consistent with expected background in each channel. The following 90% confidence level upper limits ate determined: Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)) < (1.05 to 0.84) x 10(-4) and Br(Z(d) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi e(+/-) nu(e)) < (5.8 to 5.0) x 10(-5), where the ranges quoted correspond to the range of predicted B-c(+/-) lifetimes from 0.4 to 1.4 ps, and Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)pi(-)pi(+/-)) < 1.75 x 10(-4), constant over the range of predicted B-c(+/-) lifetimes. (C) 1997 Elsevier Science B.V.

引用

页码：207 / 222

页数：16

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