MEASUREMENT OF TAU BRANCHING RATIOS

被引:0
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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
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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.
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页码:211 / 228
页数:18
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