Measurement of the Tau Polarisation at LEP

Details Measurement of the Tau Polarisation at LEP Measurement of the Tau Polarisation at LEP

2001-04-20

arxiv.org/abs/hep-ex/0104038v1

Eur.Phys.J.C20:401-430,2001

Physics

High Energy Physics

High Energy Physics - Experiment

52 pages, 30 figures

Scientific paper

10.1007/s100520100689

The polarisation of $\tau$'s produced in Z decay is measured using 160 pb$^{-1}$ of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters ${\cal A}_e = 0.1504 \pm 0.0068 $ and ${\cal A}_{\tau} = 0.1451 \pm 0.0059$ which are consistent with the hypothesis of $e$-$\tau$ universality. Assuming universality, the value ${\cal A}_{e{-}\tau} = 0.1474 \pm 0.0045$ is obtained from which the effective weak mixing angle $\sin^2 {\theta_{\mathrm{W}}^{\mathrm{eff}}} =0.23147 \pm 0.00057 $ is derived.

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