Determination of the Michel parameter in tau decay
May, 19907 pages
Published in:
- Phys.Lett.B 246 (1990) 278-284
- Published: 1990
Report number:
- DESY-90-059
Experiments:
Citations per year
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
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