J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z

被引：31

作者：

ABREU, P

ADAM, W

ADYE, T

AGASI, E

AJINENKO, I

ALEKSAN, R

ALEKSEEV, GD

ALLPORT, PP

ALMEHED, S

ALMEIDA, FML

ALVSVAAG, SJ

AMALDI, U

ANDREAZZA, A

ANTILOGUS, P

APEL, WD

APSIMON, RJ

ARNOUD, Y

ASMAN, B

AUGUSTIN, JE

AUGUSTINUS, A

BAILLON, P

BAMBADE, P

BARAO, F

BARATE, R

BARBIELLINI, G

BARDIN, DY

BARKER, GJ

BARONCELLI, A

BARRING, O

BARRIO, JA

BARTL, W

BATES, MJ

BATTAGLIA, M

BAUBILLIER, M

BAUDOT, J

BECKS, KH

BEGALLI, M

BEILLIERE, P

BELTRAN, P

BENVENUTI, AC

BERGGREN, M

BERTRAND, D

BIANCHI, F

BIGI, M

BILENKY, MS

BILLOIR, P

BJARNE, J

BLOCH, D

BLOCKI, J

BLYTH, S

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

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

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

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

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

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

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

[8] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY

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

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

[11] NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE

[12] FZU,CAS,DIV HIGH ENERGY PHYS,INST PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC

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

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

[15] SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND

[16] JOINT INST NUCL RES,DUBNA 101000,RUSSIA

[17] UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY

[18] INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND

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

[20] UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND

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

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

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

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

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

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

[27] NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK

[28] CHARLES UNIV,NUCL CTR MFF,NC,CR-18000 PRAGUE 8,CZECH REPUBLIC

[29] NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS

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

[31] UNIV OSLO,DEPT PHYS,OSLO 3,NORWAY

[32] UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN

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

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

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

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

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

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

[39] IST NAZL FIS NUCL,I-00173 ROME,ITALY

[40] CEA SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE

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

[42] UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN

[43] INST HIGH ENERGY PHYS,PROTVINO,RUSSIA

[44] UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA

[45] UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA

[46] UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN

[47] UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY

[48] IST NAZL FIS NUCL,I-10125 TURIN,ITALY

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

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

来源：

PHYSICS LETTERS B | 1994年 / 341卷 / 01期

关键词：

D O I：

10.1016/0370-2693(94)01385-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

J/psi mesons have been reconstructed from their decay to mu(+)mu(-) and e(+)e(-), using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 +/- 17 J/psi were found, 5.4 +/- 2.3 psi' were obtained in the channel J/psi(--> mu(+)mu(-))pi(+)pi(-) and 6.4 +/- 2.7 chi(c) in the channel J/psi(--> mu(+)mu(-))gamma. As the dominant source of J/psi mesons is from b quarks, the following branching ratios: Br(b-->J/psi X) = (1.12 +/- 0.12 (stat.) +/- 0.10 (syst.))%, Br(b --> psi' X) = (0.48 +/- 0.22 (stat.) +/- 0.10 (syst.))%, Br(b-->chi(cl) X) = (1.4 +/- 0.6 (stat.)(-0.2)(+0.4) (syst.))% were measured. From the proper time distribution of the J/psi sample, the average lifetime of b-hadrons decaying into J/psi was found to be: tau(B) = 1.50(-0.21)(+0.24) (stat.) +/- 0.03 (syst.) ps. A search for completely reconstructed B meson decays to final states including a J/psi gave a signal of 15 +/- 5 events.

引用

页码：109 / 122

页数：14

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