literature

Measurement of the tau polarization at LEP

Collaboration
Mar, 2001
52 pages
Published in:
  • Eur.Phys.J.C 20 (2001) 401-430
e-Print:
Report number:
  • CERN-EP-2001-027
Experiments:

Citations per year

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Abstract: (arXiv)
The polarisation of τ\tau's produced in Z decay is measured using 160 pb1^{-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{\cal A}_e = 0.1504 \pm 0.0068 and Aτ=0.1451±0.0059{\cal A}_{\tau} = 0.1451 \pm 0.0059 which are consistent with the hypothesis of ee-τ\tau universality. Assuming universality, the value Aeτ=0.1474±0.0045{\cal A}_{e{-}\tau} = 0.1474 \pm 0.0045 is obtained from which the effective weak mixing angle sin2θWeff=0.23147±0.00057\sin^2 {\theta_{\mathrm{W}}^{\mathrm{eff}}} =0.23147 \pm 0.00057 is derived.
Note:
  • 52 pages, 30 figures Report-no: CERN-EP/2001-027
  • electron positron: colliding beams
  • electron positron: annihilation
  • Z0: electroproduction
  • Z0: leptonic decay
  • tau: pair production
  • tau: leptonic decay
  • tau: semileptonic decay
  • tau: polarization
  • angular dependence
  • universality: (tau electron)