A MEASUREMENT OF PHOTON RADIATION IN LEPTON PAIR EVENTS FROM Z(0) DECAYS

被引：34

作者：

ACTON, PD

ALEXANDER, G

ALLISON, J

ALLPORT, PP

ANDERSON, KJ

ARCELLI, S

ASHTON, P

ASTBURY, A

AXEN, D

AZUELOS, G

BAHAN, GA

BAINES, JTM

BALL, AH

BANKS, J

BARKER, GJ

BARLOW, RJ

BATLEY, JR

BEAUDOIN, G

BECK, A

BECKER, J

BEHNKE, T

BELL, KW

BELLA, G

BERLICH, P

BETHKE, S

BIEBEL, O

BINDER, U

BLOODWORTH, IJ

BOCK, P

BODEN, B

BOSCH, HM

BOUGEROLLE, S

BRABSON, BB

BREUKER, H

BROWN, RM

BRUN, R

BUIJS, A

BURCKHART, HJ

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLTON, DG

CLARKE, PEL

COHEN, I

COLLINS, WJ

CONBOY, JE

COOPER, M

COUCH, M

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] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY

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

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

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

[10] UNIV LONDON,QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND

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

[12] UNIV HAMBURG,DESY 2,INST EXPTL PHYS,W-2000 HAMBURG 52,GERMANY

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

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

[15] KOBE UNIV,KOBE 657,JAPAN

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

[17] UNIV VICTORIA,DEPT PHYS,VICTORIA V8W 3P6,BC,CANADA

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

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

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

[21] INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405

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

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

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

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

[26] BIRBECK COLL,LONDON WC1E 7HV,ENGLAND

[27] CENS,DPHPE,F-91191 GIF SUR YVETTE,FRANCE

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

[29] CARLETON UNIV,CTR RES PARTICLE PHYS,OTTAWA K1S 5B6,ONTARIO,CANADA

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

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

[32] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA

[33] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 2A6,BC,CANADA

[34] MCGILL UNIV,DEPT HIGH ENERGY PHYS,IPP,MONTREAL H3A 2T8,QUEBEC,CANADA

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

[36] UNIV VICTORIA,DEPT PHYS,VICTORIA V8W 2Y2,BC,CANADA

来源：

PHYSICS LETTERS B | 1991年 / 273卷 / 03期

基金：

美国国家科学基金会; 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(91)91694-Q

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the photon yield in lepton pair events recorded by the OPAL detector in a data sample corresponding to an integrated luminosity of 7.1 pb-1 at centre-of-mass energies between 88 GeV and 94 GeV. The results are compared to QED expectations for initial and final state photon radiation. No anomalous photon yield has been found, and stringent limits on the branching ratio for exotic radiative three body Z0 decays into a photon and a pair of leptons are obtained. We also place limits on possible Z0 decays into a photon and a resonance X with subsequent decays of X into a pair of leptons. Acollinear mu+ mu- events with missing momentum along the beam direction are identified as events with hard initial state photon radiation and used to measure an average cross section of 15 +/- 6(8) pb for e+ e- annihilation into mu+ mu-, in the so far untested range of centre-of-mass energies between 60 GeV and 84 GeV. This value is consistent with a cross section of 24 pb, expected from Z0 and photon exchange.

引用

页码：338 / 354

页数：17

共 21 条

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