A STUDY OF THE REACTION E+E--]GAMMA-GAMMA AT LEP

被引：13

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,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,I-40126 BOLOGNA,ITALY

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

[18] UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HX,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,DPHPE,F-91191 GIF SUR YVETTE,FRANCE

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

[25] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE 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 / 241卷 / 01期

关键词：

D O I：

10.1016/0370-2693(90)91500-B

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The pure QED reaction e+e-→γγ has been studied at centre of mass energies around the mass of the Z0 boson using data recorded by the OPAL detector at LEP. The results are in good agreement with the QED prediction. Lower limits on the cutoff parameters of the modified electron propagator are found to be Λ+>89 GeV and Λ. The lower limit on the mass of an excited electron is 82 GeV assuming the coupling constant λ=1. Upper limits on the branching ratios of Z0→γγ, Z0→π0γ and Z0→ηγ are set at 3.7×10-4, 3.9×10-4 and 5.8×10-4 respectively. Two events from the reaction e+e-→γγγ have been observed, consistent with the QED prediction. An upper limit on the branching ratio of Z0→γγγ is set at 2.8×10-4. All the limits are given at 95% confidence level. © 1990.

引用

页码：133 / 140

页数：8

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