SEARCH FOR HIGH-MASS PHOTON PAIRS IN E+E--]F(F)OVERBAR-GAMMA-GAMMA (F = E, MU,TAU, NU, Q) AT LEP

被引：9

作者：

BUSKULIC, D

DEBONIS, I

DECAMP, D

GHEZ, P

GOY, C

LEES, JP

MINARD, MN

PIETRZYK, B

ALEMANY, R

ARIZTIZABAL, F

COMAS, P

CRESPO, JM

DELFINO, M

FERNANDEZ, E

FERNANDEZBOSMAN, M

GAITAN, V

GARRIDO, L

MATTISON, T

PACHECO, A

PADILLA, C

PASCUAL, A

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

CHAI, Y

HU, H

HUANG, D

HUANG, X

LIN, J

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHANG, L

ZHAO, W

BLUCHER, E

机构：

[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN

[2] UNIV BARI, INFN, SEZIONE BARI, I-70126 BARI, ITALY

[3] UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY

[4] CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[5] CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[6] UNIV CLERMONT FERRAND, IN2P3, CNRS, PHYS CORPUSCULAIRE LAB, F-63177 CLERMONT FERRAND, FRANCE

[7] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[8] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

[9] ECOLE POLYTECH, IN2P3, CNRS, PHYS & HAUTES ENERGIES LAB, F-91128 PALAISEAU, FRANCE

[10] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND

[11] UNIV FLORENCE, DIPARTIMENTO FIS, INFN SEZIONE FIRENZE, I-50125 FLORENCE, ITALY

[12] FLORIDA STATE UNIV, SUPERCOMPUTER COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[13] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

[14] INFN, LNF, I-00044 FRASCATI, ITALY

[15] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND

[16] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[17] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[18] UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA

[19] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[20] UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY

[21] FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[22] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY

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

[24] UNIV PISA, INFN, SEZIONE PISA, DIPARTIMENTO FIS, I-56010 PISA, ITALY

[25] SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY

[26] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

[27] RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND

[28] CE SACLAY, PAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE

[29] UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA

[30] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND

[31] UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY

[32] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[33] INFN, SEZIONE TRIESTE, I-34127 TRIESTE, ITALY

[34] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

[35] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[36] UNIV TURIN, IST COSMO GEOFIS, I-10124 TURIN, ITALY

[37] LBL, BERKELEY, CA 94720 USA

[38] UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY

来源：

PHYSICS LETTERS B | 1993年 / 308卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(93)91308-A

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The result of a search for high mass photon pairs from the processes e+ e- - ffgammagammaBAR (f = e, mu, tau, nu and q) with the ALEPH detector is reported. The result for f = e, mu and tau is to be compared with the observation of 4 events by the L3 Collaboration with invariant masses, M(gammagamma), of the two photons near 60 GeV. From a data sample approximately twice as large taken from 1990 to 1992, 6 events are found with M(gammagamma) distributed between 50 GeV and 72 GeV, while 4.9 events are expected from a QED calculation. There is no evidence for a mass peak; only one event (mu+ mu-gammagamma) at M(gammagamma) = 59.4 +/- 0.2 GeV is compatible with the L3 observation. In addition, for M(gammagamma) > 50 GeV, no event is found for e+e- - qqgammagammaBAR and only one event is found consistent with e+e- --> nunugammagamma; this event has M(gammagamma) = 58.5 +/- 1.9 GeV. High mass photon pair events have also been searched for in gammagamma collisions. This allows one to set an upper limit of 50 MeV for the width of an assumed resonance decaying to photon pairs.

引用

页码：425 / 434

页数：10

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