A precise measurement of the tau polarization and its forward-backward asymmetry at LEP

被引：22

作者：

Alexander, G

Allison, J

Altekamp, N

Ametewee, K

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Beaudoin, G

Bechtluft, J

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Berlich, P

Bethke, S

Biebel, O

Blobel, V

Bloodworth, IJ

Bloomer, JE

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlesworth, C

Charlton, DG

Chrisman, D

Chu, SL

Clarke, PEL

Cohen, I

Conboy, JE

机构：

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

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

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

[4] UNIV BONN, INST PHYS, D-53115 BONN, GERMANY

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

[6] CAVENDISH LAB, CAMBRIDGE CB3 0HE, ENGLAND

[7] CARLETON UNIV, OTTAWA CARLETON INST PHYS, DEPT PHYS, OTTAWA, ON K1S 5B6, CANADA

[8] CARLETON UNIV, CTR RES PARTICLE PHYS, OTTAWA, ON K1S 5B6, CANADA

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

[10] UNIV CHICAGO, ENRICO FERMI INST, CHICAGO, IL 60637 USA

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

[12] UNIV FREIBURG, FAK PHYS, D-79104 FREIBURG, GERMANY

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

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

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

[16] RHEIN WESTFAL TH AACHEN, INST PHYS 2, D-52056 AACHEN, GERMANY

[17] UCL, LONDON WC1E 6BT, ENGLAND

[18] UNIV MANCHESTER, SCHUSTER LAB, MANCHESTER M13 9PL, LANCS, ENGLAND

[19] UNIV MARYLAND, DEPT PHYS, COLLEGE PK, MD 20742 USA

[20] UNIV MONTREAL, PHYS NUCL LAB, MONTREAL, PQ H3C 3J7, CANADA

[21] UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA

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

[23] CTR ETUD SACLAY, CEA, DAPNIA, SPP, F-91191 GIF SUR YVETTE, FRANCE

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

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

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

[27] KOBE UNIV, KOBE 657, JAPAN

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

[29] WEIZMANN INST SCI, PARTICLE PHYS DEPT, IL-76100 REHOVOT, ISRAEL

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

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

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

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

[34] RES INST PARTICLE & NUCL PHYS, H-1525 BUDAPEST, HUNGARY

[35] INST NUCL RES, H-4001 DEBRECEN, HUNGARY

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

[37] INST NUCL RES, H-4001 DEBRECEN, HUNGARY

[38] LAJOS KOSSUTH UNIV, DEPT EXPT PHYS, DEBRECEN, HUNGARY

[39] UNIV MUNICH, MUNICH, GERMANY

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 72卷 / 03期

关键词：

D O I：

10.1007/s002880050257

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A measurement of the tau lepton polarization and its forward-backward asymmetry at the Z(0) resonance using the OPAL detector is described. The measurement is based on analyses of tau --> rho nu(tau), tau --> pi(K)nu(tau), tau --> <e(nu)over bar (e) nu(tau)>, tau --> <mu(nu)over bar (mu)nu(tau)>, and tau --> a(1) nu(tau) decays from a sample of 89075 e(+)e(-) --> tau(+)tau(-) candidates corresponding to an integrated luminosity of 117 pb(-1). Assuming that the tau lepton decays according to V-A theory, we measure the average tau polarization at root s = M(Z) to be [P-tau] = (-13.0 +/- 0.9 +/- 0.9)% and the tau polarization forward-backward asymmetry to be A(pol)(FB) = (-9.4 +/- 1.0 +/- 0.4)%, where the first error is statistical and the second systematic. These results are consistent with the hypothesis of lepton universality and, when combined, can be expressed as a measurement of sin(2) theta(eff)(lept) = 0.2334 +/- 0.0012 within the context of the Standard Model.

引用

页码：365 / 375

页数：11

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