literature

Determination of the Michel parameter in tau decay

Collaboration
May, 1990
7 pages
Published in:
  • Phys.Lett.B 246 (1990) 278-284
  • Published: 1990
Report number:
  • DESY-90-059
Experiments:

Citations per year

19901998200620142022051015
Abstract: (Elsevier)
Using the ARGUS detector at the DORIS II e + e − storage ring we have studied the electron and muon energy spectra in τ − → e − ν ν and τ − →μ − ν ν decays. The measured value of the Michel parameter, ρ =0.742±0.035±0.020, is in good agreement with a standard V-A coupling at the τ-ν τ -W vertex. Pure V, A and V + A couplings are completely excluded by this measurement. Upper limits have been obtained for two-body tau decays, including final states with a Goldstone boson.
  • electron positron: colliding beams
  • colliding beams: electron positron
  • electron positron: annihilation
  • annihilation: electron positron
  • tau: electroproduction
  • electroproduction: tau
  • tau: pair production
  • pair production: tau
  • tau: leptonic decay
  • leptonic decay: tau