A SEARCH FOR THE TOP AND B' QUARKS IN HADRONIC Z0 DECAYS

被引：49

作者：

AKRAWY, MZ

ALEXANDER, G

ALLISON, J

ALLPORT, PP

ANDERSON, KJ

ARMITAGE, JC

ARNISON, GTJ

ASHTON, P

AZUELOS, G

BAINES, JTM

BALL, AH

BANKS, J

BARKER, GJ

BARLOW, RJ

BATLEY, JR

BAVARIA, G

BEARD, C

BECK, F

BELL, KW

BELLA, G

BETHKE, S

BIEBEL, O

BLOODWORTH, IJ

BOCK, P

BOERNER, H

BREUKER, H

BROWN, RM

BRUN, R

BUIJS, A

BURCKHART, HJ

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLTON, DG

CHRIN, JTM

COHEN, I

CONBOY, JE

COUCH, M

COUPLAND, M

CUFFIANI, M

DADO, S

DALLAVALLE, GM

DAVIES, OW

DENINNO, MM

DIECKMANN, A

DITTMAR, M

DIXIT, MS

DUCHESNEAU, D

机构：

[1] TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL

[2] UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND

[3] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND

[4] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637

[5] UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637

[6] CARLETON UNIV,DEPT PHYS,OTTAWA K1S 5B6,ONTARIO,CANADA

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

[8] UNIV MONTREAL,PHYS NUCL LAB,MONTREAL H3C 3J7,QUEBEC,CANADA

[9] UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742

[10] CERN,EUROPEAN ORG PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND

[11] UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY

[12] UNIV BONN,INST PHYS,W-5300 BONN 1,GERMANY

[13] UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND

[14] UNIV BOLOGNA,DEPARTIMENTO FIS,I-40126 BOLOGNA,ITALY

[15] IST NAZL FIS NUCL,BOLOGNA,ITALY

[16] UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND

[17] UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HV,ENGLAND

[18] TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL

[19] UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521

[20] NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA

[21] WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL

[22] CENS,DEPT PHYS PARTICULES ELEMENT,F-91191 GIF SUR YVETTE,FRANCE

[23] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS,TOKYO 113,JAPAN

[24] UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN

[25] KOBE UNIV,KOBE 657,JAPAN

[26] UNIV FREIBURG,FAK PHYS,W-7800 FREIBURG,GERMANY

[27] BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND

来源：

PHYSICS LETTERS B | 1990年 / 236卷 / 03期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(90)90999-M

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a search for new quarks in hadronic Z° decays. From the event shape analysis of a data sample containing 2185 multihadronic annihilation events, we observe no evidence for the top or b' quarks. We derive limits for the top and b' quark masses under the assumption of various possible standard model and non-standard model decay schemes. Our search is sensitive to quark masses larger than 23 GeV/c2; it yields the following lower limits at a 95% confidence level: 44.5 GeV/c2 for the top quark mass and 45.2 GeV/c2 for the b′ quark mass. © 1990.

引用

页码：364 / 374

页数：11

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