UPDATED MEASUREMENT OF THE TAU-LIFETIME

被引：23

作者：

AKERS, R

ALEXANDER, G

ALLISON, J

ANDERSON, KJ

ARCELLI, S

ASAI, S

ASTBURY, A

AXEN, D

AZUELOS, G

BALL, AH

BARBERIO, E

BARLOW, RJ

BARTOLDUS, R

BATLEY, JR

BEAUDOIN, G

BECK, A

BECK, GA

BECKER, J

BEESTON, C

BEHNKE, T

BELL, KW

BELLA, G

BENTKOWSKI, P

BENTVELSEN, S

BERLICH, P

BETHKE, S

BIEBEL, O

BLOODWORTH, IJ

BOCK, P

BOSCH, HM

BOUTEMEUR, M

BRAIBANT, S

BRIGHTTHOMAS, P

BROWN, RM

BUIJS, A

BURCKHART, HJ

BURGARD, C

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLESWORTH, C

CHARLTON, DG

CHU, SL

CLARKE, PEL

CLAYTON, JC

CLOWES, SG

COHEN, I

CONBOY, JE

机构：

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

[2] INFN,I-40126 BOLOGNA,ITALY

[3] UNI VBONN,INST PHYS,D-53115 BONN,GERMANY

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

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

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

[7] INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405

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

[9] UNIV TOKYO,INT CTR ELEMENTARY PARTICLE,TOKYO 113,JAPAN

[10] UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742

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

[12] KOBE UNIV,KOBE 657,JAPAN

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

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

[15] ALBERT LUDWIGS UNIV,FAK PHYS,D-79104 FREIBURG,GERMANY

[16] UNIV HEIDELBERG,INST PHYS,D-69120 HEIDELBERG,GERMANY

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

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

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

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

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

[22] CENS,CEA,F-91191 GIF SUR YVETTE,FRANCE

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

[24] WEIZMANN INST SCI,DETP PARTICLE PHYS,IL-76100 REHOVOT,ISRAEL

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

[26] UNIV OREGON,DEPT PHYS,EUGENE,OR 97403

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

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

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

[30] UNIV HAMBURG,DESY 2,INST EXPTL PHYS,D-22607 HAMBURG,GERMANY

[31] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA

[32] TH AACHEN,INST PHYS 3,D-52056 AACHEN,GERMANY

[33] DUKE UNIV,DEPT PHYS,DURHAM,NC 27708

[34] UNIV ALBERTA,DEPT PHYS,EDMONTON T6G 2J1,ALBERTA,CANADA

[35] TRIUMF,VANCOUVER V6T 2A3,BC,CANADA

[36] UNIV VICTORIA,DEPT PHYS,VICTORIA V8W 3P6,BC,CANADA

来源：

PHYSICS LETTERS B | 1994年 / 338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; 以色列科学基金会;

关键词：

D O I：

10.1016/0370-2693(94)90805-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an update of our measurement of the tau lepton lifetime, using data taken during 1992 and 1993 with the OPAL detector at LEP. The lifetime is determined from analyses of the impact parameters of tracks from tau decays to a single charged particle, and the reconstructed decay lengths from tau decays to three charged particls. With the added statistics (which increase the tau pair event sample size by more than a factor of four over our 1990 and 1991 data sample), the updated lifetime measurement is: tau(tau) = 288.8 +/- 2.2 (stat) +/- 1.4 (sys) fs. When combined with world-average measurements of the tau leptonic branching fractions (assuming e-mu universality), the ratio of charged-current couplings is: (g(tau)/g(mu)) = .005 +/- 0.007, in agreement with the hypothesis of tau-mu charged-current universality.

引用

页码：497 / 506

页数：10

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