First Observation of the Decay τ- --> K*-ηντ
Abstract
The decay τ--->K*-ηντ has been observed with the CLEO II detector. The K*- is reconstructed in two decay channels, K*--->KSπ--->π-π+π- and K*--->K-π0. The η is reconstructed from the decay η-->γγ. The measured branching fraction is B\(τ--->K*-ηντ\) = \(2.9+/-0.8+/-0.4\)×10-4. We also measure the inclusive branching fractions without requiring the K* resonance, B\(τ--->KSπ-ηντ\) = \(1.10+/-0.35+/-0.11\)×10-4 and B\(τ--->K-π0ηντ\) = \(1.77+/-0.56+/-0.71\)×10-4. The results indicate that the K*- resonance dominates the KSπ- mass spectrum.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1999
- DOI:
- 10.1103/PhysRevLett.82.281
- arXiv:
- arXiv:hep-ex/9809012
- Bibcode:
- 1999PhRvL..82..281B
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 10 pages, postscript file also available through http://w4.lns.cornell.edu/public/CLNS