Measurement of τ polarisation at LEP

被引：27

作者：

Acciarri, M

Adriani, O

Aguilar-Benitez, M

Ahlen, S

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Ball, RC

Banerjee, S

Banicz, K

Barczyk, A

Barillere, R

Barone, L

Bartalini, P

Baschirotto, A

Basile, M

Battiston, R

Bay, A

Becattini, F

Becker, U

Behner, F

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Bhattacharya, S

Biasini, M

Biland, A

Bilei, GM

Blaising, JJ

Blyth, SC

Bobbink, GJ

Bock, R

Bohm, A

Boldizsar, L

Borgia, B

Bourilkov, D

机构：

[1] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[2] Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany

[3] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[4] NIKHEF, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[5] Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands

[6] Univ Michigan, Ann Arbor, MI 48109 USA

[7] Lab Annecy Le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France

[8] Johns Hopkins Univ, Baltimore, MD 21218 USA

[9] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[10] Inst High Energy Phys, Beijing 100039, Peoples R China

[11] Humboldt Univ, D-10099 Berlin, Germany

[12] Univ Bologna, I-40126 Bologna, Italy

[13] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[14] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[15] Boston Univ, Boston, MA 02215 USA

[16] Northeastern Univ, Boston, MA 02115 USA

[17] Inst Atom Phys, R-76900 Bucharest, Romania

[18] Univ Bucharest, R-76900 Bucharest, Romania

[19] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary

[20] MIT, Cambridge, MA 02139 USA

[21] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[22] Univ Florence, I-50125 Florence, Italy

[23] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[24] FBLJA Project, World Lab, CH-1211 Geneva 23, Switzerland

[25] Univ Geneva, CH-1211 Geneva 4, Switzerland

[26] Univ Sci & Technol China, Hefei 230029, Anhui, Peoples R China

[27] Res Inst High Energy Phys, SEFT, SF-00014 Helsinki, Finland

[28] Univ Lausanne, CH-1015 Lausanne, Switzerland

[29] Ist Nazl Fis Nucl, I-73100 Lecce, Italy

[30] Univ Lecce, I-73100 Lecce, Italy

[31] Los Alamos Natl Lab, Los Alamos, NM 87544 USA

[32] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

[33] CIEMAT, E-28040 Madrid, Spain

[34] Inst Theoret & Expt Phys, Moscow 117259, Russia

[35] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[36] Univ Naples Federico II, I-80125 Naples, Italy

[37] Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus

[38] Catholic Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[39] Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands

[40] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[41] CALTECH, Pasadena, CA 91125 USA

[42] Ist Nazl Fis Nucl, I-06100 Perugia, Italy

[43] Univ Perugia, I-06100 Perugia, Italy

[44] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[45] Princeton Univ, Princeton, NJ 08544 USA

[46] Ist Nazl Fis Nucl, I-00185 Rome, Italy

[47] Univ Roma La Sapienza, I-00185 Rome, Italy

[48] Russian Acad Sci, Inst Nucl Phys, St Petersburg, Russia

[49] Univ Salerno, I-84100 Salerno, Italy

[50] INFN, I-84100 Salerno, Italy

来源：

PHYSICS LETTERS B | 1998年 / 429卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00406-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb(-1), the tau longitudinal polarisation has been measured as a function of the production polar angle using the tau decays tau(-) --> h(-)nu(tau) (h = pi,rho,a(1)) and tau(-)-->l(-)<(nu)over bar>(l)nu(tau) (l = e,mu). From this measurement the quantities A(c) and A(tau), which depend on the couplings of the electron and the tau to the Z, are determined to be A(c) = 0.1678 +/- 0.0127 +/- 0.0030 and A(tau) = 0.1476 +/- 0.0088 +/- 0.0062, consistent with the hypothesis of e-tau universality, Under this assumption a value of A(l) = 0.1540 +/- 0.0074 +/- 0.0044 is obtained, yielding the value of the effective weak mixing angle sin(2)<(theta)over bar>(W) = 0.2306 +/- 0.0011. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：387 / 398

页数：12

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