Measurement of the Michel parameters and the average tau neutrino helicity from tau decays in e(+)e(-)->tau(+)tau(-)

被引：20

作者：

Acciarri, M

Adam, A

Adriani, O

AguilarBenitez, M

Ahlen, S

Alpat, B

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alverson, G

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Antreasyan, D

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Ball, RC

Banerjee, S

Banicz, K

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

Biasini, M

Biland, A

Bilei, GM

Blaising, JJ

Blyth, SC

Bobbink, GJ

Bock, R

Bohm, A

Borgia, B

Boucham, A

Bourilkov, D

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] NIKHEF H, NL-1009 DB AMSTERDAM, NETHERLANDS

[4] UNIV AMSTERDAM, NL-1009 DB AMSTERDAM, NETHERLANDS

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

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

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

[8] UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND

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

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

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

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

[13] BOSTON UNIV, BOSTON, MA 02215 USA

[14] NORTHEASTERN UNIV, BOSTON, MA 02115 USA

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

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

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

[18] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

[19] MIT, CAMBRIDGE, MA 02139 USA

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

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

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

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

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

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

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

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

[28] IST NAZL FIS NUCL, I-73100 LECCE, ITALY

[29] UNIV LECCE, I-73100 LECCE, ITALY

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

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

[32] CIEMAT, E-28040 MADRID, SPAIN

[33] INST THEORET & EXPTL PHYS, MOSCOW 117259, RUSSIA

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

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

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

[37] UNIV NIJMEGEN, NL-6525 ED NIJMEGEN, NETHERLANDS

[38] NATL INST NUCL PHYS & HIGH ENERGY PHYS, NL-6525 ED NIJMEGEN, NETHERLANDS

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

[40] CALTECH, PASADENA, CA 91125 USA

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

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

[47] INST PHYS NUCL, ST PETERSBURG, RUSSIA

[48] UNIV SALERNO, I-84100 SALERNO, ITALY

[49] IST NAZL FIS NUCL, I-84100 SALERNO, ITALY

[50] UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA

来源：

PHYSICS LETTERS B | 1996年 / 377卷 / 04期

关键词：

D O I：

10.1016/0370-2693(96)00467-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Michel parameters rho, eta, xi and xi delta, the chirality parameter xi(h) and the tau polarization P-tau are measured using 32012 tau pair decays. Their values are extracted from the energy spectra of leptons and hadrons in tau(-) --> l(-)<(nu)over bar>(l) nu(tau) and tau(-) --> pi(-)nu(tau) decays, the energy and decay angular distributions in tau(-) --> rho(-)nu(tau) decays, and the correlations in the energy spectra and angular distributions of the decay products. Assuming universality in leptonic and semileptonic tau decays, the results are rho = 0.794+/-0.039+/-0.031, eta = 0.25+/-0.17+/-0.11, xi = 0.94+/-0.21+/-0.07, xi delta = 0.81+/-0.14+/-0.06, xi(h) = -0.970+/-0.053+/-0.011, and P-tau = -0.154+/-0.018+/-0.012. The measurement is in agreement with the V-A hypothesis for the weak charged current.

引用

页码：313 / 324

页数：12

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