Improved tau polarisation measurement

被引：18

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] INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, F-74019 ANNECY LE VIEUX, FRANCE

[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, 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, PHYS NUCL & HAUTES 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 & MED, 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] MAX PLANCK INST PHYS, WERNER HEISENBERG INST, D-80805 MUNICH, GERMANY

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

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

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

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

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

[25] CENS, CEA, 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, EXPTL ELEMENTARY PARTICLE PHYS, SEATTLE, WA 98195 USA

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

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

[34] UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY

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

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

[37] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA

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

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

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 69卷 / 02期

关键词：

D O I：

10.1007/s002880050019

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Using 22 pb(-1) of data collected at LEP in 1992 on the peak of the Z resonance, the ALEPH collaboration has measured the polarisation of the tau leptons decaying into e nu nu, mu nu nu,pi nu and a(1) nu from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where, in terms of the axial and vector couplings g(Al) and g(nu l), A(l) = 2 g(nu l) g(Al)/(g(nu l)(2) + g(Al)(2)). This analysis follows to a large extent the methods devised for the 1990 and 1991 data but with improvements which bring a better understanding of the systematic uncertainties. Combining the 1992 measurements with our previously published results yields A(tau) = 0.136 +/- 0.012 +/- 0.009 and A(e) = 0.129 +/- 0.016 +/- 0.005. Assuming e-tau universality, the measurements imply an effective weak mixing angle of sin(2) theta(W)(eff) = 0.2332 +/- 0.0014.

引用

页码：183 / 193

页数：11

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