Search for high mass gamma gamma resonances in e(+)e(-)->l(+)l(-)gamma gamma, nu(nu)over-bar-gamma gamma and q(q)over-bar-gamma gamma at LEP I

被引：3

作者：

Abreu, P

Adam, W

Adye, T

Agasi, E

Ajinenko, I

Aleksan, R

Alekseev, GD

Alemany, R

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Andreazza, A

Andrieux, ML

Antilogus, P

Apel, WD

Arnoud, Y

Asman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barate, R

Barbi, M

Bardin, DY

Baroncelli, A

Barring, O

Barrio, JA

Bartl, W

Bates, MJ

Battaglia, M

Baubillier, M

Baudot, J

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Benvenuti, AC

Berggren, M

Bertini, D

Bertrand, D

Bianchi, F

Bigi, M

Bilenky, MS

Billoir, P

Bloch, D

Blume, M

Bolognese, T

Bonesini, M

机构：

[1] IOWA STATE UNIV,AMES LAB,AMES,IA 50011

[2] IOWA STATE UNIV,DEPT PHYS,AMES,IA 50011

[3] UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM

[4] FREE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM

[5] UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM

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

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

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

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

[10] CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL

[11] PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL

[12] UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL

[13] COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA

[14] COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE

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

[16] UNIV STRASBOURG 1,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE

[17] DEMOKRITOS NATL CTR SCI RES,INST PHYS NUCL,GR-15310 ATHENS,GREECE

[18] FZU,INST PHYS,CAS,DIV HIGH ENERGY PHYS,PRAGUE 18040 8,CZECH REPUBLIC

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

[20] IST NAZL FIS NUCL,I-16146 GENOA,ITALY

[21] UNIV GRENOBLE 1,IN2P3,CNRS,INST NUCL SCI,F-38026 GRENOBLE,FRANCE

[22] SEFT,RES INST HIGH ENERGY PHYS,FIN-00014 HELSINKI,FINLAND

[23] JOINT INST NUCL RES,MOSCOW 101000,RUSSIA

[24] UNIV KARLSRUHE,INST EXPT KERNPHYS,D-76128 KARLSRUHE,GERMANY

[25] INST PHYS NUCL,PL-30055 KRAKOW,POLAND

[26] STANISLAW STASZIC UNIV MIN & MET,PL-30055 KRAKOW,POLAND

[27] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE

[28] UNIV LANCASTER,SCH PHYS & CHEM,LANCASTER LA1 4YB,ENGLAND

[29] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND

[30] UNIV PARIS 06,IN2P3,CNRS,LPNHE,F-75252 PARIS 05,FRANCE

[31] UNIV PARIS 07,IN2P3,CNRS,LPNHE,F-75252 PARIS 05,FRANCE

[32] LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN

[33] UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE

[34] UNIV COMPLUTENSE,E-28040 MADRID,SPAIN

[35] UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE

[36] UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY

[37] IST NAZL FIS NUCL,I-20133 MILAN,ITALY

[38] NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK

[39] CHARLES UNIV,NC,NUCL CTR,MFF,AREAL MFF,PRAGUE 18000 8,CZECH REPUBLIC

[40] NIKHEF H,NL-1009 DB AMSTERDAM,NETHERLANDS

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

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

[43] UNIV OVIEDO,DEPT FIS,OVIEDO 33006,SPAIN

[44] UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND

[45] UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY

[46] IST NAZL FIS NUCL,I-35131 PADUA,ITALY

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

[48] UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY

[49] IST NAZL FIS NUCL,I-00173 ROME,ITALY

[50] CEA,CE SACLAY,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 72卷 / 02期

关键词：

D O I：

10.1007/s002880050236

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A search for high mass photon pairs from the processes e(+)e(-) --> l(+)l(-)gamma gamma, e(+)e(-) --> <q(q)over bar gamma gamma> and e(+)e(-) --> nu nu gamma gamma with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z(0) decays, collected by DELPHI during the years 1991 to 1994, 79 events with two charged leptons and two isolated photons were selected with photon pair masses above 10 GeV/c(2), where 76 +/- 6 events were predicted from standard sources. In the same data sample, no <nu(nu)over bar gamma gamma> candidates were found and no accumulation of events was visible for gamma gamma masses above 10 GeVlc2 in the q<q(q)over bar gamma gamma> channel. Upper limits at 95% confidence level on the Z(0) branching ratios for the three different channels were extracted from the data. In the mass region m(gamma gamma) > 30 CeV/c(2) the limits obtained are between 3x10(-6) and 4x10(-6).

引用

页码：179 / 190

页数：12

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