A Measurement of the Michel parameters in leptonic decays of the tau
Collaboration
10 pages
Published in:
- Phys.Rev.Lett. 78 (1997) 4686-4690
PDG: or ) PARAMETER
Report number:
- CLNS-96-1429,
- CLEO-96-15,
- SLAC-PUB-9811
Experiments:
- CESR-CLEO-II
Citations per year
Abstract: (APS)
We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e−μ universality in the vectorlike couplings, we find ρeμ=0.735±0.013±0.008 and ηeμ=−0.015±0.061±0.062, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.- electron positron: colliding beams
- electron positron: annihilation
- tau: electroproduction
- tau: pair production
- tau: leptonic decay
- lepton: momentum spectrum
- Michel parameter
- model: weak interaction
- universality: (muon electron)
- vertex function: (W tau neutrino/tau)
References(10)
Figures(0)