Production and properties of the τ-lepton in e+e- annihilation at C.M. energies from 12 to 31.6 GeV
Abstract
We have observed τ production in e+e- annihilation at centre-of-mass energies between 12 and 31.6 GeV with cross sections in agreement with the QED τ-pair cross section. Branching ratios for τ decay have been measured and are consistent with the world averages. We have determined the cutoff parameters of QED Λ+ (Λ-) to be > 73 GeV (82 GeV) and have obtained an upper limit on the τ lifetime of 1.4 × 10-12 s(95% CL).
Supported in part by the US Department of Energy contract WY-76-C-02-0881.- Publication:
-
Physics Letters B
- Pub Date:
- May 1980
- DOI:
- 10.1016/0370-2693(80)90337-8
- Bibcode:
- 1980PhLB...92..199B