AN IMPROVED MEASUREMENT OF ALPHA-S (MZ0) USING ENERGY CORRELATIONS WITH THE OPAL DETECTOR AT LEP

被引：38

作者：

ACTON, PD

ALEXANDER, G

ALLISON, J

ALLPORT, PP

ANDERSON, KJ

ARCELLI, S

ASHTON, P

ASTBURY, A

AXEN, D

AZUELOS, G

BAHAN, GA

BAINES, JTM

BALL, AH

BANKS, J

BARKER, GJ

BARLOW, RJ

BATLEY, JR

BEAUDOIN, G

BECK, A

BECKER, J

BEHNKE, T

BELL, KW

BELLA, G

BERLICH, P

BETHKE, S

BIEBEL, O

BINDER, U

BLOODWORTH, IJ

BOCK, P

BODEN, B

BOSCH, HM

BOUGEROLLE, S

BRABSON, BB

BREUKER, H

BROWN, RM

BRUN, R

BUIJS, A

BURCKHART, HJ

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLTON, DG

CLARKE, PEL

COHEN, I

COLLINS, WJ

CONBOY, JE

COOPER, M

COUCH, M

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 USA

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

[6] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY

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

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

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

[10] UNIV LONDON, QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND

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

[12] UNIV HAMBURG, DESY, INST EXPTL PHYS 2, W-2000 HAMBURG 52, GERMANY

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

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

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

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

[17] INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA

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

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

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

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

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

[23] CENS, DPHPE, F-91191 GIF SUR YVETTE, FRANCE

[24] UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA

[25] CARLETON UNIV, CTR RES PARTICLE PHYS, OTTAWA K1S 5B6, ONTARIO, CANADA

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

[27] UNIV TOKYO, INST CTR ELEMENTARY PARTICLE PHYS, TOKYO 113, JAPAN

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

[29] KOBE UNIV, KOBE 657, JAPAN

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

来源：

PHYSICS LETTERS B | 1992年 / 276卷 / 04期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0370-2693(92)91681-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on an improved measurement of the value of the strong coupling constant sigma(s) at the Z0 peak, using the asymmetry of the energy-energy correlation function. The analysis, based on second-order perturbation theory and a data sample of about 145 000 multihadronic Z0 decays, yields alpha(s)(M(z0)) = 0.118 +/- 0.001 (stat.) +/- 0.003 (exp. syst.)-0.004(+0.009)(theor. syst.), where the theoretical systematic error accounts for uncertainties due to hadronization, the choice of the renormalization scale and unknown higher-order terms. We adjust the parameters of a second-order matrix element Monte Carlo followed by string hadronization to best describe the energy correlation and other hadronic Z0 decay data. The as result obtained from this second-order Monte Carlo is found to be unreliable if values of the renormalization scale smaller than about 0.15 E(cm) are used in the generator.

引用

页码：547 / 564

页数：18

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