Strange b baryon production and lifetime in Z decays

被引：44

作者：

Buskulic, D

DeBonis, I

Decamp, D

Ghez, P

Goy, C

Lees, JP

Lucotte, A

Minard, MN

Nief, JY

Odier, P

Pietrzyk, B

Casado, MP

Chmeissani, M

Crespo, JM

Delfino, M

Efthymiopoulos, I

Fernandez, E

FernandezBosman, M

Garrido, L

Juste, A

Martinez, M

Orteu, S

Padilla, C

Park, IC

Pascual, A

Perlas, JA

Riu, I

Sanchez, F

Teubert, F

Coaleo, A

Creanza, D

dePalma, M

Gelao, G

Girone, M

Iaselli, G

Maggi, G

Maggi, M

Marinelli, N

Nuzzo, S

Ranieri, A

Raso, G

Ruggieri, F

Selvaggi, G

Silvestris, L

Tempesta, P

Zito, G

Huang, X

Lin, J

Ouyang, Q

Wang, T

机构：

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

[2] IST NAZL FIS NUCL, DIPARTIMENTO FIS, 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, PHYS CORPUSCULAIRE LAB, IN2P3, CNRS, F-63177 CLERMONT FERRAND, FRANCE

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

[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

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

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

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

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

[12] IST NAZL FIS NUCL, LAB NAZL FRASCATI, 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 PHYS EXPT, 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, CTR PHYS PARTICULES, IN2P3, CNRS, 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, D-80805 MUNICH, GERMANY

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

[24] UNIV PISA, DIPARTIMENTO FIS, IST NAZL FIS NUCL, I-56010 PISA, ITALY

[25] SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY

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

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

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

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

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

[34] UNIV WASHINGTON, SEATTLE, WA 98195 USA

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

[36] UNIV TURIN, IST FIS GEN, TURIN, ITALY

[37] CNR, IST COSMOGEOFIS, I-10133 TURIN, ITALY

[38] UNIV BARCELONA, BARCELONA 08208, SPAIN

[39] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA

[40] UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY

来源：

PHYSICS LETTERS B | 1996年 / 384卷 / 1-4期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1016/0370-2693(96)00925-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Xi(b) is performed with a study of Xi-lepton correlations. Forty-four events with same sign Xi(-)l(-) combinations are found whereas 8.4 are expected based on the rate of opposite sign Xi(-)l(+) combinations. This significant excess is interpreted as evidence for Xi(b) semileptonic decays. The measured product branching ratio is Br(b-->Xi(b))xBr(Xi(b)-->X(c)Xl(-)<(nu)over bar (l)>)xBr(X(c)-->Xi(-)X')=(5.4+/-1.1(stat)+/-0.8(syst))x10(-4) per lepton species, averaged over electrons and muons, with X(c) a charmed baryon. The Xi(b) lifetime is measured to be tau(Xi b)=1.35(-0.28)(+0.37)(stat)(-0.17)(+0.15)(syst) ps.

引用

页码：449 / 460

页数：12

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