A MEASUREMENT OF THE B BARYON LIFETIME

被引：29

作者：

BUSKULIC, D

DECAMP, D

GOY, C

LEES, JP

MINARD, MN

MOURS, B

ALEMANY, R

ARIZTIZABAL, F

COMAS, P

CRESPO, JM

DELFINO, M

FERNANDEZ, E

GAITAN, V

GARRIDO, L

PACHECO, A

PASCUAL, A

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

MAGGI, M

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

HU, H

HUANG, D

HUANG, X

LIN, J

LOU, J

QIAO, C

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ATWOOD, WB

BAUERDICK, LAT

BLUCHER, E

BONVICINI, G

BOSSI, F

机构：

[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN

[2] INFN, I-70126 BARI, ITALY

[3] UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY

[4] CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

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

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

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

[8] DEMOCRITOS NUCL RES CTR, GR-15310 ATHENS, GREECE

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

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

[11] UNIV FLORENCE, DIPARTIMENTO FIS, INFN, I-50125 FLORENCE, ITALY

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

[13] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

[14] INFN, LAB NAZL, I-00044 FRASCATI, ITALY

[15] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND

[16] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[17] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[18] UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA

[19] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[20] UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY

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

[22] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY

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

[24] UNIV PISA, DIPARTIMENTO FIS, INFN, I-56100 PISA, ITALY

[25] SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY

[26] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

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

[28] LE SACLAY, DAPNIA, SERV PHYS PARTICULE, F-91191 GIF SUR YVETTE, FRANCE

[29] CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND

[30] LBL, BERKELEY, CA 94720 USA

[31] UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA

[32] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S10 2TN, S YORKSHIRE, ENGLAND

[33] UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY

[34] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[35] UNIV NAPLES, I-80138 NAPLES, ITALY

[36] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[37] UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY

[38] INFN, I-34127 TRIESTE, ITALY

[39] UNIV NAPLES, DIPARTIMENTO SCI FIS, I-80138 NAPLES, ITALY

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

[41] UNIV NAPLES, DIPARTIMENTO SCI FIS, I-80138 NAPLES, ITALY

[42] SLAC, STANFORD, CA 94309 USA

[43] CNR, IST COSMO GEOFIS, TURIN, ITALY

来源：

PHYSICS LETTERS B | 1992年 / 297卷 / 3-4期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

D O I：

10.1016/0370-2693(92)91284-G

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In 451 000 hadronic Z0 decays, recorded with the ALEPH detector at LEP, the yields of lambdal- and lambdal+ combinations are measured. Semileptonic decays of b baryons result in a signal of 122 +/- 18(stat.)+22/-23(syst.) lambdal- combinations. From a fit to the impact parameter distribution of the leptons in the lambdal- sample, the lifetime of b baryons is measured to be 1.12+0.32/-0.29(stat.) +/- 0.16(syst.) ps.

引用

页码：449 / 458

页数：10

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