A MEASUREMENT OF tau-POLARIZATION AT LEP

被引：31

作者：

ACCIARRI, M

ADAMS, A

ADRIANI, O

AGUILARBENITEZ, M

AHLEN, S

ALCARAZ, J

ALOISIO, A

ALVERSON, G

ALVIGGI, MG

AMBROSI, G

AN, Q

ANDERHUB, H

ANDERSON, AL

ANDREEV, VP

ANGELESCU, T

ANTONOV, L

ANTREASYAN, D

ALKHAZOV, G

ARCE, P

AREFIEV, A

AZEMOON, T

AZIZ, T

BABA, PVKS

BAGNAIA, P

BAKKEN, JA

BAKSAY, L

BALL, RC

BANERJEE, S

BANICZ, K

BARILLERE, R

BARONE, L

BASCHIROTTO, A

BASILE, M

BATTISTON, R

BAY, A

BECATTINI, F

BECKER, U

BEHNER, F

BENCZE, GL

BERDUGO, J

BERGES, P

BERTUCCI, B

BETEV, BL

BIASINI, M

BILAND, A

BILEI, GM

BIZZARRI, R

BLAISING, JJ

BOBBINK, GJ

BOCK, R

机构：

[1] RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY

[2] RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY

[3] NATL INST NUCL & HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS

[4] UNIV MICHIGAN, ANN ARBOR, MI 48109 USA

[5] LAB ANNECY LE VIEUX PHYS PARTICULES, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE

[6] JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA

[7] INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA

[8] HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY

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

[10] TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA

[11] BOSTON UNIV, BOSTON, MA 02215 USA

[12] NORTHEASTERN UNIV, BOSTON, MA 02115 USA

[13] INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA

[14] UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA

[15] HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY

[16] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

[17] MIT, CAMBRIDGE, MA 02139 USA

[18] IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY

[19] UNIV FLORENCE, I-50125 FLORENCE, ITALY

[20] CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[21] WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND

[22] UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND

[23] UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA

[24] SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND

[25] UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND

[26] LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA

[27] UNIV LYON 1, INST PHYS NUCL LYON, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE

[28] CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN

[29] INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA

[30] IST NAZL FIS NUCL, I-80125 NAPLES, ITALY

[31] UNIV NAPLES, I-80125 NAPLES, ITALY

[32] UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS

[33] CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

[34] NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS

[35] OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA

[36] CALTECH, PASADENA, CA 91125 USA

[37] IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY

[38] UNIV PERUGIA, I-06100 PERUGIA, ITALY

[39] CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA

[40] PRINCETON UNIV, PRINCETON, NJ 08544 USA

[41] IST NAZL FIS NUCL, I-00185 ROME, ITALY

[42] UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY

[43] NUCL PHYS INST, ST PETERSBURG, RUSSIA

[44] UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA

[45] UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN

[46] BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA

[47] KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA

[48] UNIV ALABAMA, TUSCALOOSA, AL 35486 USA

[49] PURDUE UNIV, W LAFAYETTE, IN 47907 USA

[50] PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND

来源：

PHYSICS LETTERS B | 1994年 / 341卷 / 02期

基金：

匈牙利科学研究基金会;

关键词：

D O I：

10.1016/0370-2693(94)90316-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With a data sample of 86 000 Z --> tau(+)tau>(-)(gamma) events collected in 1990 through 1993 we have measured the polarization of tau-leptons as a function of the production polar angle using the following 1-prong tau decay modes: tau(-) --> e(-)<(nu)over bar>(e) nu(tau),tau(-) --> mu(-)<(nu)over bar>(mu)nu(tau), tau(-) --> pi(-)(K-)nu(tau),tau(-) --> rho(-)nu(tau) and tau(-) --> a(1)(-)nu(tau). We obtain for the ratio of vector to axial-vector weak neutral couplings for electrons gVe/gAe = 0.0791 +/- 0.0099(stat) +/- 0.0025(syst) and taus gV tau/gA tau = 0.0752 +/- 0.0063(stat) +/- 0.0045(syst) consistent with the hypothesis of e - tau universality. Assuming universality of the e - tau neutral current we determine the effective electroweak mixing angle to be sin(2) theta(W)(eff) = 0.2309 +/- 0.0016.

引用

页码：245 / 256

页数：12

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