TY - JOUR

T1 - Measurement of the tau polarization at the Z resonance

AU - Buskulic, D.

AU - Finch, Alexander

AU - ALEPH Collaboration

PY - 1993

Y1 - 1993

N2 - Using 18.8 pb−1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes τ→ev vˉ , τ→μv vˉ , τ→πν, τ→ρν and τ→a 1ν, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersA τ andA e , whereA l =2g v l g A l /(g v l )2+(g A l )2] The resultsA τ=0.143±0.023 andA e =0.120±0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin2θ w eff=0.2332±0.0022.

AB - Using 18.8 pb−1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes τ→ev vˉ , τ→μv vˉ , τ→πν, τ→ρν and τ→a 1ν, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersA τ andA e , whereA l =2g v l g A l /(g v l )2+(g A l )2] The resultsA τ=0.143±0.023 andA e =0.120±0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin2θ w eff=0.2332±0.0022.

U2 - 10.1007/BF01498618

DO - 10.1007/BF01498618

M3 - Journal article

VL - 59

SP - 369

EP - 386

JO - Zeitschrift für Physik C Particles and Fields

JF - Zeitschrift für Physik C Particles and Fields

SN - 0170-9739

IS - 3

ER -