MEASUREMENT OF TAU BRANCHING RATIOS

被引：0

作者：

DECAMP, D

DESCHIZEAUX, B

GOY, C

LEES, JP

MINARD, MN

ALEMANY, R

CRESPO, JM

DELFINO, M

FERNANDEZ, E

GAITAN, V

GARRIDO, L

MIR, LM

PACHECO, A

CATANESI, MG

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

RUAN, T

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ATWOOD, WB

BAUERDICK, LAT

BIRD, F

BLUCHER, E

BONVICINI, G

机构：

[1] UNIV AUTONOMA BARCELONA,FIS ALTAS ENERGIAS LAB,E-08193 BARCELONA,SPAIN

[2] IST NAZL FIS NUCL,SEZIONE BARI,I-70126 BARI,ITALY

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

[4] CHINESE ACAD SCI,DEPT 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,F-63177 CLERMONT FERRAND,FRANCE

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

[8] DEMOCRITOS NUCL RES CTR,ATHENS,GREECE

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

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

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

[12] IST NAZL FIS NUCL,SEZIONE FIS,I-50125 FLORENCE,ITALY

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

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

[15] IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY

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

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

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

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

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

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

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

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

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

[25] UNIV PISA,IST NAZL FIS NUCL,SEZIONE PISA,DIPARTIMENTO FIS,I-560100 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,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE

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

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

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

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

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

[34] SLAG,STANFORD,CA 94309

[35] UNIV WASHINGTON,SEATTLE,WA 98195

[36] CNR,IST COSMOGEOFIS,TURIN,ITALY

[37] LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

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

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

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

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1992年 / 54卷 / 02期

关键词：

D O I：

暂无

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the tau-lepton have been measured assuming lepton universality in Z0 decays. The inclusive branching fractions for the tau-decay into one, three, and five charged particles have been determined to be (85.45 +/- 0.97)%, (14.35 +/- 0.48)%, and (0.10 +/- 0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes tau --> 3 hadrons + nu(tau) and tau --> hadron + 2-pi(0)nu(tau), which are significantly larger. These latter branching ratios have been found to be (9.5 +/- 0.7)% and (10.2 +/- 1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4 +/- 1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.

引用

页码：211 / 228

页数：18

共 50 条

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