Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Improved tau polarization measurement
AU - Buskulic, D.
AU - Finch, Alexander
AU - ALEPH Collaboration
PY - 1995
Y1 - 1995
N2 - 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 intoevv ¯ ,μvv ¯ ,πν, ρν and a1ν from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersNτ andNe, where, in terms of the axial and vector couplingsgAl andgVl,Nl=2gVl gAl/(gVl2+gAl2). 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 yieldsNτ=0.136±0.012±0.009 andNe=0.129±0.016±0.005. Assuminge−τ universality, the measurements imply an effective weak mixing angle of sin2θWeff=0.2332±0.0014.
AB - 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 intoevv ¯ ,μvv ¯ ,πν, ρν and a1ν from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersNτ andNe, where, in terms of the axial and vector couplingsgAl andgVl,Nl=2gVl gAl/(gVl2+gAl2). 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 yieldsNτ=0.136±0.012±0.009 andNe=0.129±0.016±0.005. Assuminge−τ universality, the measurements imply an effective weak mixing angle of sin2θWeff=0.2332±0.0014.
U2 - 10.1007/BF02907399
DO - 10.1007/BF02907399
M3 - Journal article
VL - 69
SP - 183
EP - 193
JO - Zeitschrift für Physik C Particles and Fields
JF - Zeitschrift für Physik C Particles and Fields
SN - 0170-9739
IS - 1
ER -