A STUDY OF D-ASTERISK+PI(-)-PRODUCTION IN SEMILEPTONIC B-DECAY

被引：20

作者：

BUSKULIC, D

CASPER, D

DEBONIS, I

DECAMP, D

GHEZ, P

GOY, C

LEES, JP

MINARD, MN

ODIER, P

PIETRZYK, B

ARIZTIZABAL, F

CHMEISSANI, M

CRESPO, JM

EFTHYMIOPOULOS, I

FERNANDEZ, E

FERNANDEZBOSMAN, M

GAITAN, V

GARRIDO, L

MARTINEZ, M

ORTEU, S

PACHECO, A

PADILLA, C

PALLA, F

PASCUAL, A

PERLAS, JA

SANCHEZ, F

TEUBERT, F

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

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

OUYANG, Q

WANG, T

XIE, Y

XU, R

XUE, S

机构：

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

[2] INFN,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,CNRS,IN2P3,PHYS CORPUSCULAIRE LAB,F-63177 CLERMONT FERRAND,FRANCE

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

[7] NRCD,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

[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 LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND

[17] UNIV MAINZ,INST PHYS,D-55099 MAINZ,GERMANY

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

[19] WERNER HEISENBERG INST,MAX PLANCK INST PHYS,D-80805 MUNICH,GERMANY

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

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

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

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

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

[25] CEA SACLAY,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE

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

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

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

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

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

[31] UNIV WASHINGTON,SEATTLE,WA 98195

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

来源：

PHYSICS LETTERS B | 1995年 / 345卷 / 01期

关键词：

D O I：

10.1016/0370-2693(94)01585-Z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a sample of 1.5 million hadronic decays of the Z collected by the ALEPH detector, a search is carried out for the decays (B) over bar --> D-1(0)(2420)l(-)<(nu)over bar>X and (B) over bar --> D-2(*0)(2460)l(-)<(nu)over bar>X. The product branching ratio for D-1(0) production is measured to be Br(b --> (B) over bar) x Br((B) over bar --> D(1)(0)l(-)<(nu)over bar>X) x Br(D-1(0) --> D-*+<pi(-)) = (2.04 +/- 0.58(stat)+/- 0.34(syst) x 10 (-3), and a 95% confidence level limit of Br(b --> (B) over bar) x Br((B) over bar --> D(2)(*0)l(-)<(nu)over bar>X) x Br(D-2(*0) --> D(*+)pi(-)) less than or equal to less than or equal to 0.81 X 10(-3) is obtained for D-2(*0) production. A topological search sensitive to the processes above, but also to wide resonances that decay to D(*+)pi(-) and to non-resonant D(*+)pi(-) production is also carried out, yielding Br(b--> (B) over bar B) xBr((B) over bar -->D(*+)pi(-) l(-)<(nu)over bar>X>)= (3.7 +/- 1.0(stat) +/- 0.7(syst)) x 10(-3). Direct evidence of D(*)pi production inconsistent with D-1(0) and D-2(*0) in semileptonic B decay is presented.

引用

页码：103 / 114

页数：12

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