A SEARCH FOR NEW QUARKS AND LEPTONS FROM Z0 DECAY AT LEP

被引：79

作者：

DECAMP, D

DESCHIZEAUX, B

LEES, JP

MINARD, MN

CRESPO, JM

DELFINO, M

FERNANDEZ, E

MARTINEZ, M

MIQUEL, R

MIR, LM

ORTEU, S

PACHECO, A

PERLAS, JA

TUBAU, E

CATANESI, MG

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

NATALI, S

NUZZO, S

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

HU, H

HUANG, D

LIN, J

RUAN, T

WANG, T

WU, W

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ALBRECHT, H

ATWOOD, WB

BIRD, F

BLUCHER, E

BURNETT, TH

CHARITY, T

DREVERMANN, H

GARRIDO, L

GRAB, C

HAGELBERG, R

机构：

[1] UNIV AUTONOMA BARCELONA,FIS ALTAS ENERGIAS LAB,E-08193 BARCELONA,SPAIN

[2] UNIV BARI,DEPARTIMENTO FIS,I-70126 BARI,ITALY

[3] IST NAZL FIS NUCL,BARI,ITALY

[4] CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA

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

[6] UNIV CLERMONT FERRAND,CNRS,INST NATL PHYS NUCL PHYS PARTICULES,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,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,F-91128 PALAISEAU,FRANCE

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

[11] UNIV FLORENCE,IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-50125 FLORENCE,ITALY

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

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

[14] IST NAZL FIS NUCL,LAB NAZL FRASCATI,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,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,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,CTR PHYS PARTICULES,F-13288 MARSEILLE 9,FRANCE

[22] MAX PLANCK INST PHYS & ASTROPHYS,W-8000 MUNICH 40,GERMANY

[23] UNIV PARIS 11,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE

[24] UNIV PISA,IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-56100 PISA,ITALY

[25] SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY

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

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

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

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

[30] UNIV GESAMTHSCH SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN 21,GERMANY

[31] UNIV TRIESTE,DEPARTIMENTO FIS,I-34127 TRIESTE,ITALY

[32] IST NAZL FIS NUCL,TRIESTE,ITALY

[33] UNIV WISCONSIN,MADISON,WI 53706

来源：

PHYSICS LETTERS B | 1990年 / 236卷 / 04期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(90)90392-J

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for Z0 decays into pairs of possible new heavy quarks (t and b′), new heavy charged leptons (L±), stable heavy neutral leptons (νL) and unstable heavy neutral leptons (L0) is performed on data collected by the ALEPH detector corresponding to 11 550 events of Z0→hadrons. The limits on the masses of the heavy quarks are Mt > 45.8 GeV and Mb′ > 46.0 GeV, allowing for both charged-current and flavor-changing neutral-current decays of the b′. If an L± decays into a stable νL, then for MνL<42.7 GeV, the mass of L± is excluded for all values of ML > MνL. Finally, while the mass of the stable νL is excluded up to 42.7 GeV, the mass of the unstable L0 is excluded up to 45.7 GeV with the mixing parameters |UℓL|2 down to 10-13 at this mass. For 25.0 GeV < ML < 42.7 GeV, all values of |UℓL|2 are excluded. All limits are given at 95% CL. © 1990.

引用

页码：511 / 522

页数：12

共 37 条

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