Measurement of τ lifetime and branching ratios
Abstract
Precise results are reported for the τ-lepton lifetime and several τ branching ratios obtained with the MAC detector operating at PEP at √s =29 GeV. We find ττ=(3.15+/-0.36+/-0.4)×10 -13 sec. Results for the topological branching ratios B1, B3, B5 (τ decaying into 1, 3, 5 charged particles) are B3≡1-B1=0.133+/-0.003+/-0 .006 and B5<0.0017 at the 95% confidence level. The fraction of all three-prong decays unaccompanied by π0's is found to be 0.61+/-0.03+/-0.05.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 1985
- DOI:
- 10.1103/PhysRevLett.54.1624
- Bibcode:
- 1985PhRvL..54.1624F
- Keywords:
-
- 14.60.Jj;
- 13.35.+s