THE REACTION E+E--] GAMMA-GAMMA(GAMMA) AT Z0 ENERGIES

被引：31

作者：

ABREU, P

ADAM, W

ADAMI, F

ADYE, T

AKESSON, T

ALEKSEEV, GD

ALLEN, P

ALMEHED, S

ALTED, F

ALVSVAAG, SJ

AMALDI, U

ANASSONTZIS, E

ANTILOGUS, P

APEL, WD

APSIMON, RJ

ASMAN, B

ASTIER, P

AUGUSTIN, JE

AUGUSTINUS, A

BAILLON, P

BAMBADE, P

BARAO, F

BARBIELLINI, G

BARDIN, DY

BARONCELLI, A

BARRING, O

BARTL, W

BATTAGLIA, M

BATES, MJ

BAUBILLIER, M

BECKS, KH

BEESTON, CJ

BEGALLI, M

BEILLIERE, P

BELOKOPYTOV, Y

BELTRAN, P

BENEDIC, D

BENLLOCH, JM

BERGGREN, M

BERTRAND, D

BIAGI, S

BIANCHI, F

BIBBY, JH

BILENKY, MS

BILLOIR, P

BJARNE, J

BLOCH, D

BLYTH, S

BOGOLUBOV, PN

BOLOGNESE, T

机构：

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

[2] UNIV LUND,S-22362 LUND,SWEDEN

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

[4] UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE

[5] UNIV WARSAW,PL-00681 WARSAW,POLAND

[6] UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY

[7] UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN

[8] UNIV PARIS 06,PHYS NUCL & HAUTES ENERGIES LAB,F-75230 PARIS 05,FRANCE

[9] UNIV MILAN,DIPARTMENTO FIS,I-20133 MILAN,ITALY

[10] AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA

[11] CENS,DEPT PHYS & PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE

[12] JOINT INST NUCL RES,MOSCOW 101000,USSR

[13] UNIV VALENCIA,CSIC,CTR MIXTO,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN

[14] UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY

[15] UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE

[16] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

[17] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011

[18] IST NAZL FIS NUCL,PADUA,ITALY

[19] UNIV INSTELLING ANTWERP,B-2610 WILRIJK,BELGIUM

[20] NATL INST NUCL PHYS,ROME,ITALY

[21] UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND

[22] UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY

[23] IST NAZL FIS NUCL,TURIN,ITALY

[24] UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY

[25] UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN

[26] IST NAZL FIS NUCL,BOLOGNA,ITALY

[27] UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND

[28] UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY

[29] UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN

[30] UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY

[31] UNIV COMPLUTENSE MADRID,DEPT FIS ATOM MOLEC & NUCL,E-28040 MADRID,SPAIN

[32] NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK

[33] INST NUCL STUDIES,PL-00681 WARSAW,POLAND

[34] NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE

[35] INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND

[36] UNIV AIX MARSEILLE 2,FAC SCI LUMINY,F-13288 MARSEILLE 09,FRANCE

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

[38] UNIV PARIS 07,F-75230 PARIS 05,FRANCE

[39] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE

[40] UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY

[41] IST NAZL FIS NUCL,TRIESTE,ITALY

[42] UNIV UDINE,IST FIS,I-33100 UDINE,ITALY

[43] IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY

[44] NATL INST NUCL PHYS,MILAN,ITALY

[45] UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY

[46] COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE

[47] SERPUKHOV HIGH ENERGY PHYS INST,PROTVINO 142284,USSR

[48] DEMOCRITOS NUCL RES CTR,INST NUCL PHYS,GR-15310 ATHENS,GREECE

[49] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND

[50] UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY

来源：

PHYSICS LETTERS B | 1991年 / 268卷 / 02期

关键词：

D O I：

10.1016/0370-2693(91)90819-C

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The total and differential cross-sections for the reaction e+e- --> gamma-gamma(gamma) are measured at centre of mass energies around 91 GeV using an integrated luminosity of 4.7 pb-1. The agreement with the QED prediction is good. Consequently there is no evidence for non-standard channels which would have the same experimental signature. The lower limits on the QED cutoff parameters are LAMBDA+ > 113 GeV and LAMBDA- > 95 GeV. An upper limit on the effective coupling between a possible excited electron and the gamma is derived. At 95% confidence level the branching ratios for Z0 decay into pi-0-gamma, eta-gamma and gamma-gamma-gamma are below 1.5 x 10(-4), 2.8 x 10(-4) and 1.4 x 10(-4) respectively.

引用

页码：296 / 304

页数：9

共 21 条

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