SEARCH FOR A NEW WEAKLY INTERACTING PARTICLE

被引：7

作者：

DECAMP, D ^{[1
]}

DESCHIZEAUX, B

GOY, C

LEES, JP

MINARD, MN

ALEMANY, R

CRESPO, JM

DELFINO, M

FERNANDEZ, E

GAITAN, V

GARRIDO, L

MIR, LM

PACHECO, A

CATANESI, MG

CREANZA, D

DE PALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

MAGGI, M

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

GAO, Y

HU, H

HUANG, D

HUANG, X

LIN, J

LOU, J

QIAO, C

RUAN, T

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ATWOOD, WB

BIRD, F

BLUCHER, E

BONVICINI, G

BOSSI, F

机构：

[1] CNRS, IN2P3, LAB PHYS PARTICULES, F-74019 ANNECY LE VIEUX, FRANCE

[2] UNIV AUTONOMA BARCELONA, LAB FIS ALTA ENERGIES, E-08193 BELLATERRA BARCELONA, SPAIN

[3] IST NAZL FIS NUCL, SEZ BARI, I-70126 BARI, ITALY

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

[5] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

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

[7] UNIV BLAISE PASCAL, LAB PHYS CORPUSCULAIRE, F-63177 AUBIERE, FRANCE

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

[9] NUCL RES CTR DEMOKRITOS, GR-15310 ATHENS, GREECE

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

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

[12] UNIV FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY

[13] IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY

[14] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

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

[16] IST NAZL FIS NUCL, LNF, I-00044 FRASCATI, ITALY

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

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

[19] IMPERIAL COLL, DEPT PHYS, London SW7 2BZ, ENGLAND

[20] UNIV INNSBRUCK, INST EXPT PHYS, A-6020 INNSBRUCK, AUSTRIA

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

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

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

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

[25] UNIV PARIS SUD, CNRS, IN2P3, LAB ACCELERATEUR LINEAIRE, F-91405 ORSAY, FRANCE

[26] UNIV PISA, DIPARTIMENTO FIS, INFN, SEZ PISA, I-56010 PISA, ITALY

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

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

[29] RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, Didcot OX11 0QX, Oxon, ENGLAND

[30] CEN SACLAY, DEPT PHYS PARTICULES ELEMENTAIRES, F-91191 GIF SUR YVETTE, FRANCE

[31] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, ENGLAND

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

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

[34] IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY

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

[36] SLAC, STANFORD, CA 94309 USA

[37] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[38] FAC SCI, CTR PHYS PARTICULES, F-13288 MARSEILLE 9, FRANCE

[39] UNIV TORINO, IST FIS GEN, I-10124 TURIN, ITALY

[40] CNR, IST COSMO GEOFIS, I-10133 TURIN, ITALY

[41] LBL, BERKELEY, CA 94720 USA

来源：

PHYSICS LETTERS B | 1991年 / 262卷 / 01期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

D O I：

10.1016/0370-2693(91)90657-C

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for events of the type e+e- --> l+l-X0, where X0 can be any weakly interacting particle which couples to the Z, has been performed with the ALEPH detector at LEP, by searching for acollinear lepton pairs. Such particles can be excluded up to a mass of 7.0 GeV/c2 for a value of the ratio of branching fractions, Br(Z --> X0l+l-)/Br(Z --> l+l-), greater than 2.5 X 10(-3) if the X0 has third component of isospin, I3 greater than 1/2 and decays to a pair of virtual gauge bosons. When this analysis is combined with the previous results of the Higgs particle searches from ALEPH, this limit can be extended to an X0 mass of 60 GeV/c2.

引用

页码：139 / 147

页数：9

共 11 条

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