Measurement of the Michel parameters and the average tau-neutrino helicity from tau decays at LEP

被引：14

作者：

Acciarri, M ^{[1
]}

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, Sez Milano, 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 H, 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, IN2P3, CNRS, 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, Sez Bologna, 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] Univ Bucharest, R-76900 Bucharest, Romania

[18] Inst Atom Phys, 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, Sez Firenze, I-50125 Florence, Italy

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

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

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

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

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

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

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

[29] Ist Nazl Fis Nucl, Sez Lecce, 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, Inst Phys Nucl, IN2P3, CNRS, F-69622 Villeurbanne, France

[33] CIEMAT, E-28040 Madrid, Spain

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

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

[36] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

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

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

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

[40] CALTECH, Pasadena, CA 91125 USA

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

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

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

[44] Princeton Univ, Princeton, NJ 08544 USA

[45] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

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

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

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

[49] Ist Nazl Fis Nucl, I-84100 Salerno, Italy

[50] Univ Calif San Diego, San Diego, CA 92093 USA

来源：

PHYSICS LETTERS B | 1998年 / 438卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)01082-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Four of the Michel parameters and the average tau-neutrino helicity have been measured by analysing tan decay spectra in 147 pb(-1) of data collected by the L3 detector. The decays tau(-) --> e(-)nu(tau)<(nu)over bar>(e), tau(-) --> mu(-)nu(tau)<(nu)over bar>(mu), tau(-) --> pi(-)nu(tau), tau(-) --> rho(-)nu(tau) and their charge conjugates were considered. The results: rho = 0.762 +/- 0.035, eta = 0.27 +/- 0.14, xi = 0.70 +/- 0.16, xi delta = 0.70 +/- 0.11 and xi(h) = -1.032 +/- 0.031 are consistent with a V-A structure for the weak charged current and lepton universality, (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：405 / 416

页数：12

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