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Measurement of the tau polarization at LEP

Research output: Contribution to journalJournal articlepeer-review

<mark>Journal publication date</mark>2001
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number3
Number of pages30
Pages (from-to)401-430
Publication StatusPublished
<mark>Original language</mark>English


The polarisation of τ '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 Ae=0.1504±0.0068 and Aτ=0.1451±0.0059 which are consistent with the hypothesis of e- τ universality. Assuming universality, the value Ae-τ=0.1474±0.0045 is obtained from which the effective weak mixing angle sin2θeffW=0.23147±0.00057 is derived.