MICHEL PARAMETERS AND TAU-NEUTRINO HELICITY FROM DECAY CORRELATIONS IN Z-]TAU(+)TAU(-)

被引：25

作者：

BUSKULIC, D

CASPER, D

DEBONIS, I

DECAMP, D

GHEZ, P

GOY, C

LEES, JP

MINARD, MN

ODIER, P

PIETRZYK, B

ARIZTIZABAL, F

CHMEISSANI, M

CRESPO, JM

EFTHYMIOPOULOS, I

FERNANDEZ, E

FERNANDEZBOSMAN, M

GAITAN, V

GARRIDO, L

MARTINEZ, M

ORTEU, S

PACHECO, A

PADILLA, C

PALLA, F

PASCUAL, A

PERLAS, JA

SANCHEZ, F

TEUBERT, F

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

MARINELLI, N

NATALI, S

NUZZO, S

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

HUANG, X

LIN, J

OUYANG, Q

WANG, T

XIE, Y

XU, R

XUE, S

机构：

[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN

[2] IST NAZL FIS NUCL, DIPARTIMENTO FIS, I-70126 BARI, ITALY

[3] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

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

[5] UNIV CLERMONT FERRAND, IN2P3, CNRS, PHYS CORPUSCULAIRE LAB, F-63177 CLERMONT FERRAND, FRANCE

[6] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE

[8] ECOLE POLYTECH, IN2P3, CNRS, PHYS NUCL & HAUTE ENERGIES LAB, F-91128 PALAISEAU, FRANCE

[9] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND

[10] UNIV FLORENCE, IST NAZL FIS NUCL, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY

[11] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[12] IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[13] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND

[14] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, D-69120 HEIDELBERG, GERMANY

[15] UNIV LONDON IMPERIAL COLL SCI & TECHNOL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[16] UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA

[17] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[18] UNIV MAINZ, INST PHYS, D-55099 MAINZ, GERMANY

[19] FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[20] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST PHYS, D-80805 MUNICH, GERMANY

[21] UNIV PARIS 11, IN2P3, CNRS, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE

[22] UNIV PISA, IST NAZL FIS NUCL, DIPARTIMENTO FIS, I-56010 PISA, ITALY

[23] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

[24] RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND

[25] CEA SACLAY, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE

[26] UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA

[27] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND

[28] UNIV SIEGEN, FACHBEREICH PHYS, D-57068 SIEGEN, GERMANY

[29] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[30] IST NAZL FIS NUCL, I-34127 TRIESTE, ITALY

[31] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[32] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

[33] UNIV TURIN, IST FIS GEN, TURIN, ITALY

[34] CNR, IST COSMOGEOFIS, I-10133 TURIN, ITALY

[35] UNIV BARCELONA, E-08208 BARCELONA, SPAIN

[36] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA

[37] UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY

[38] SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY

来源：

PHYSICS LETTERS B | 1995年 / 346卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(95)00107-V

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Michel parameters and the average tau-neutrino helicity are measured using correlations between the decays of the tau(+) and tau(-) produced on the Z resonance and observed in the ALEPH detector at LEP. The Michel parameters, rho(e), eta(e), xi(e), (delta xi)(e), are determined from tau --> e ($) over bar upsilon(e) upsilon(tau) with e = (e, mu), and the average tau neutrino helicity, (h(upsilon(tau))), from tau --> h tau with h = (pi, rho, a(1)). The results obtained with e-mu universality are: rho(e) = 0.751 +/- 0.039 +/- 0.022, eta(e) = -0.04 +/- 0.15 +/- 0.11, xi(e) = 1.18 +/- 0.15 +/- 0.06, (delta xi)(e) = 0.88 +/- 0.11 +/- 0.07, and the average tau neutrino helicity (h(upsilon(tau))) = -1.006 +/- 0.032 +/- 0.019. No significant deviation from the Standard Model V-A prediction is observed.

引用

页码：379 / 388

页数：10

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