EVIDENCE FOR FINAL-STATE PHOTONS IN MULTIHADRONIC DECAYS OF THE Z0

被引：40

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

DEBU, P

DENINNO, MM

DIECKMANN, A

DITTMAR, M

DIXIT, MS

DUCHOVNI, E

机构：

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

[2] UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS,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,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] CENS,DPHPE,F-91191 GIF SUR YVETTE,FRANCE

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

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

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

[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

[28] TRIUMF,VANCOUVER V6T 2A3,BC,CANADA

来源：

PHYSICS LETTERS B | 1990年 / 246卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(90)91347-E

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From the observed yield and properties of isolated energetic photons in the reaction e+e-→Z0→hadrons+γ measured with the OPAL detector at LEP, evidence for final state radiation from primary quarks is obtained. Combined with the measurement of the total hadronic width of the Z0, the observed rate allows the extraction of the electroweak coupling constants of up and down type quarks: ν 1 32 + a 1 32 = 1.24±0.47 and ν 2 32 + a 2 32 = 1.72±0.70 No evidence for additional photon production from anomalous decays of the Z0 or from decays of new particles is found. This measurement limits the contribution to the total Z0 width from such sources to be less than 8.2 MeV at the 95% confidence level. © 1990.

引用

页码：285 / 296

页数：12

共 35 条

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