Determination of the average lifetime of b-baryons

被引：13

作者：

Abreu, P

Adam, W

Adye, T

Agasi, E

Ajinenko, I

Aleksan, R

Alekseev, GD

Alemany, R

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Andreazza, A

Andrieux, ML

Antilogus, P

Apel, WD

Arnoud, Y

Asman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barate, R

Barbi, M

Bardin, DY

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

Bertrand, D

Bianchi, F

Bigi, M

Bilenky, MS

Billoir, P

Bloch, D

Blume, M

Blyth, S

Bolognese, T

机构：

[1] IOWA STATE UNIV,AMES LAB,AMES,IA 50011

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

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

[4] VUB,IIHE,ULB,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,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY

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

[10] CTR BRASILEIRO PESQUISAS FIS,RJ-22290 RIO JANEIRO,BRAZIL

[11] PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,RJ-22453 RIO JANEIRO,BRAZIL

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

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

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

[15] CERN,CH-1211 GENEVA,SWITZERLAND

[16] CTR RECH NUCL,IN2P3,CNRS,ULP,F-67037 STRASBOURG,FRANCE

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

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

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

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

[21] UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 GRENOBLE,FRANCE

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

[23] JOINT INST NUCL RES,MOSCOW 101000,RUSSIA

[24] UNIV MIN & MET,INST NUCL PHYS,D-76128 KARLSRUHE,GERMANY

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

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

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

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

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

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

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

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

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

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

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

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

[37] CHARLES UNIV,NC,NUCL CTR MFF,PRAGUE 18000,CZECH REPUBLIC

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

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

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

[41] UNIV OVIEDO,DEPT FIS,OVIEDO 33006,SPAIN

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

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

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

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

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

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

[48] CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE

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

[50] UC,CSIC,INST FIS CANTABRIA,SANTANDER 39006,SPAIN

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 71卷 / 02期

关键词：

D O I：

10.1007/s002880050164

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The average lifetime of b-baryons has been studied using 3 x 10(6) hadronic Z(0) decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different observables: the proper decay time distribution of 206 vertices reconstructed with a Lambda, a lepton and an oppositely charged pion; the impact parameter distribution of 441 muons with high transverse momentum accompanied by a Lambda in the same jet; and the proper decay time distribution of 125 Lambda(c)-lepton decay vertices with the Lambda(c) exclusively reconstructed through its pK pi, pK(0) and Lambda 3 pi decay modes. The combined result is: [GRAPHICS] where the first systematic error is due to experimental uncertainties and the second to the uncertainties in the modelling of the b-baryon production and semi-leptonic decay, Including the measurement recently published by DELPHI based on a sample of proton-muon vertices, the average b-baryon lifetime is: [GRAPHICS] [GRAPHICS]

引用

页码：199 / 210

页数：12

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