A COMBINED ANALYSIS OF THE HADRONIC AND LEPTONIC DECAYS OF THE Z0

被引：81

作者：

AKRAWY, MZ

ALEXANDER, G

ALLISON, J

ALLPORT, PP

ANDERSON, KJ

ARMITAGE, JC

ARNISON, GTJ

ASHTON, P

AZUELOS, G

BAINES, JTM

BALL, AH

BANKS, J

BARKER, GJ

BARLOW, RJ

BATLEY, JR

BECKER, J

BEHNKE, T

BELL, KW

BELLA, G

BETHKE, S

BIEBEL, O

BINDER, U

BLOODWORTH, IJ

BOCK, P

BREUKER, H

BROWN, RM

BRUN, R

BUIJS, A

BURCKHART, HJ

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLTON, DG

CHRIN, JTM

COHEN, I

COLLINS, WJ

CONBOY, JE

COUCH, M

COUPLAND, M

CUFFIANI, M

DADO, S

DALLAVALLE, GM

DENINNO, MM

DIECKMANN, A

DITTMAR, M

DIXIT, MS

DUCHOVNI, E

DUERDOTH, IP

机构：

[1] TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL

[2] UNIV MANCHESTER,DEPT PHYS,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND

[3] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND

[4] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637

[5] UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637

[6] CARLETON UNIV,DEPT PHYS,OTTAWA K1S 5B6,ONTARIO,CANADA

[7] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[8] UNIV MONTREAL,PHYS NUCL LAB,MONTREAL H3C 3J7,QUEBEC,CANADA

[9] UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742

[10] UNIV FREIBURG,FAK PHYS,W-7800 FREIBURG,GERMANY

[11] CERN,EUROPEAN ORG PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND

[12] UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY

[13] UNIV BONN,INST PHYS,W-5300 BONN 1,GERMANY

[14] UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND

[15] UNIV BOLOGNA,DEPARTIMENTO FIS,I-40126 BOLOGNA,ITALY

[16] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

[17] UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND

[18] UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HV,ENGLAND

[19] TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL

[20] UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521

[21] NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA

[22] WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL

[23] CENS,DEPT PHYS PARTICULES ELEMENT,F-91191 GIF SUR YVETTE,FRANCE

[24] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS,TOKYO 113,JAPAN

[25] UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN

[26] KOBE UNIV,KOBE 657,JAPAN

[27] BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND

来源：

PHYSICS LETTERS B | 1990年 / 240卷 / 3-4期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0370-2693(90)91137-Z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a measurement of the mass of the Z0 boson, its total width, and its partial decay widths into hadrons and leptons. On the basis of 25 801 hadronic decays and 1999 decays into electrons, muons or taus, selected over eleven energy points between 88.28 GeV and 95.04 GeV, we obtain from a combined fit to hadrons and leptons a mass of Mz=91.154±0.021 (exp)±0.030 (LEP) GeV, and a total width of Γz=2.536±0.045 GeV. The errors on Mz have been separated into the experimental error and the uncertainty due to the LEP beam energy. The measured leptonic partial widths are Γee=81.2±2.6 MeV, Γμμ=82.6± 5.8 MeV, and Γττ=85.7±7.1 MeV, consistent with lepton universality. From a fit assuming lepton universality we obtain Γℓ ℓ- = 81.9±2.0 MeV. The hadronic partial width is Γhad=1838±46 MeV. From the measured total and partial widths a model independent value for the invisible width is calculated to be Γinv=453±44 MeV. The errors quoted include both the statistical and the systematic uncertainties. © 1990.

引用

页码：497 / 512

页数：16

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