A PRECISE DETERMINATION OF THE NUMBER OF FAMILIES WITH LIGHT NEUTRINOS AND OF THE Z BOSON PARTIAL WIDTHS

被引：135

作者：

DECAMP, D

DESCHIZEAUX, B

LEES, JP

MINARD, MN

CRESPO, JM

DELFINO, M

FERNANDEZ, E

MARTINEZ, M

MIQUEL, R

MIR, LM

ORTEU, S

PACHECO, A

PERLAS, JA

TUBAU, E

CATANESI, MG

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

NATALI, S

NUZZO, S

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

HU, H

HUANG, D

LIN, J

RUAN, T

WANG, T

WU, W

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ALBRECHT, H

ATWOOD, WB

BIRD, F

BLUCHER, E

BURNETT, TH

CHARITY, T

DREVERMANN, H

GARRIDO, L

GRAB, C

HAGELBERG, R

机构：

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

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

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

[4] CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA

[5] CERN,CH-1211 GENEVA 23,SWITZERLAND

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

[7] DEMOCRITOS NUCL RES CTR,ATHENS,GREECE

[8] UNIV CLERMONT FERRAND,INST NATL PHYS NUCL & PHYS PARTICLES,CNRS,PHYS CORPUSCULAIRE LAB,F-63177 CLERMONT FERRAND,FRANCE

[9] ECOLE POLYTECH,INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,F-91128 PALAISEAU,FRANCE

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

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

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

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

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

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

[23] UNIV PARIS 11,INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,F-91405 ORSAY,FRANCE

[24] IST NAZL FIS NUCL,DEPARTIMENTO FIS,PISA,ITALY

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

[26] UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,EGHAM TW20 0EX,SURREY,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,DEPARTIMENTO FIS,I-34127 TRIESTE,ITALY

[32] IST NAZL FIS NUCL,TRIESTE,ITALY

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

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

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

来源：

PHYSICS LETTERS B | 1990年 / 235卷 / 3-4期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

D O I：

10.1016/0370-2693(90)91984-J

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

More extensive and precise results are reported on the parameters of Z decay. On the basis of 20 000 Z decays collected with the ALEPH detector at LEP we find Mz=91.182±0.026 (exp.) ±0.030 (beam) GeV, Γz=2.541±0.056 GeV and σhad 0=41.4±0.8 nb. The partial widths for the hadronic and leptonic channels are Γhad=1804±44 MeV, Γe=82.1±3.4 MeV, Γμ=87.9±6.0 MeV and Γτ=86.1±5.6 MeV, in good agreement with the standard model. On the basis of the average leptonic width Γℓ=83.9±2.2 MeV, the effective weak mixing angle is found to be sin2θw(Mz)=0.231±0.008. Usin g the partial widths calculated in the standard model, the number of light neutrino families is Nν=3.01±0.15 (exp.)±0.05 (theor.). © 1990.

引用

页码：399 / 411

页数：13

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