OBSERVATION OF THE SEMILEPTONIC DECAYS OF BS AND LAMBDA-B HADRONS AT LEP

被引：38

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

GAO, Y

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

机构：

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

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

[3] IST NAZL FIS NUCL,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,INST NATL PHYS NUCL & PHYS PARTICULES,CLERMONT,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,F-91128 PALAISEAU,FRANCE

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

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

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

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

[14] IST NAZL FIS NUCL,NAZL LAB,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,INST NATL PHYS NUCL & PHYS PARTICULES,F-13288 MARSEILLE,FRANCE

[22] MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY

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

[24] UNIV PISA,IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-56100 PISA,ITALY

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

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

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

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

[29] UNIV CALIF SANTA CRUZ,INST PARTICLE PHYS,SANTA CRUZ,CA 95064

[30] UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND

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

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

[33] IST NAZL FIS NUCL,TRIESTE,ITALY

[34] UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706

[35] STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309

[36] UNIV WASHINGTON,SEATTLE,WA 98195

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

[38] NAPLES UNIV,DIPARTIMENTO SCI FIS,I-80134 NAPLES,ITALY

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

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

[41] LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

来源：

PHYSICS LETTERS B | 1992年 / 294卷 / 01期

关键词：

D O I：

10.1016/0370-2693(92)91654-R

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In 450000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of D(s)-l+ and LAMBDA(c)+l- combinations have been measured. 16.0 +/- 4.3 D(s)-l+ combinations were observed in the D(s)- --> phipi- channel and 17.0 +/- 4.5 combinations were observed in the D(s)- --> K*0K- channel. 21.0 +/- 5.0 LAMBDA(c)+l- combinations were observed, with the LAMBDA(c)+ reconstructed in the decay mode LAMBDA(c)+ --> pK-pi+. These events provide evidence for the decays B(s) --> D(s)-Xl+nu and LAMBDA(b) --> LAMBDA(c)+Xl-nuBAR. Assuming that the B(s) and LAMBDA(b) semileptonic decays are dominantly three-body, these observed yields, after background subtraction, translate into the following product branching ratios: Br(bBAR --> B(s))Br(B(s) --> D(s)-Xl+nu) = 0.040 +/- 0.011 +0.010/-0.012, Br(b --> LAMBDA(b))Br(LAMBDA(b) --> LAMBDA(c)+Xl-nuBAR) = 0.030 +/- 0.007 +/- 0.009.

引用

页码：145 / 156

页数：12

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