A MEASURE VERTICAL-BAR-V-CB-VERTICAL-BAR FROM (B)OVER-BAR(0)-]D-ASTERISK+L-(NU)OVER-BAR(L)

被引：49

作者：

BUSKULIC, D

CASPER, D

DEBONIS, I

DECAMP, D

GHEZ, P

GOY, C

LEES, JP

LUCOTTE, A

MINARD, MN

ODIER, P

PIETRZYK, B

ARIZTIZABAL, F

CHMEISSANI, M

CRESPO, JM

EFTHYMIOPOULOS, I

FERNANDEZ, E

FERNANDEZBOSMAN, M

GAITAN, V

GARRIDO, LI

MARTINEZ, M

ORTEU, S

PACHECO, A

PADILLA, C

PALLA, F

PASCUAL, A

PERLAS, JA

SANCHEZ, F

TEUBERT, F

COLALEO, A

CREANZA, D

DEPALMA, M

FARILLA, A

GELAO, G

GIRONE, M

IASELLI, G

MAGGI, G

MAGGI, M

MARINELLI, N

NATALI, S

NUZZO, S

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

HUANG, X

LIN, J

机构：

[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-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, IN2P3, PHYS CORPUSCULAIRE LAB, CNRS, F-63177 CLERMONT FERRAND, FRANCE

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

[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

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

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

[10] UNIV FLORENCE, IST NAZL FIS NUCL, DIPARTIMENTO FIS, 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, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[16] UNIV INNSBRUCK, INST EXPTL PHYS, 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, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[20] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, D-80805 MUNICH, GERMANY

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

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

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

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

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

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

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

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

[29] UNIV SIEGEN, FACHBEREICH PHYS, D-57068 SIEGEN, GERMANY

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

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

[32] UNIV WASHINGTON, SEATTLE, WA 98195 USA

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

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

[35] CNR, IST COSMO GEOFIS, I-10126 TURIN, ITALY

[36] UNIV BARCELONA, E-08208 BARCELONA, SPAIN

[37] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA

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

来源：

PHYSICS LETTERS B | 1995年 / 359卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(95)01021-H

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From approximately 3 million hadronic decays of Z bosons recorded with the ALEPH detector at LEP, a sample of 410 +/- 32 ($) over bar B-0 --> D*(+)l(-)nu(l) candidates is selected, where l is either an electron or a muon. The differential decay rate d Gamma(($) over bar B-0 --> D*(+)l(-)nu(l))/d omega from this sample is fitted, yielding a value for the product of the CKM matrix element \V-cb\ and the normalisation of the decay form factor at the point of zero recoil of the D*(+) meson F(omega = 1)\V-cb\ = (31.4 +/- 2.3(stat) +/- 2.5(syst)) x 10(-3). A value for \V-cb\ is extracted using theoretical calculations of the form factor normalisation, with the result \V-cb\ = (34.5 +/- 2.5(stat) +/- 2.7(syst) +/- 1.5(theory)) X 10(-3) From the integrated spectrum, the measured branching fraction is Br(($) over bar B-0 --> D*(+)l(-)nu) = (5.18 +/- 0.30(stat) +/- 0.62(syst))%.

引用

页码：236 / 248

页数：13

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