Measurements of branching fractions of τ lepton decays with one or more KS0
Abstract
We report measurements of branching fractions of τ lepton decays to final states with a KS0 meson using a 669 fb-1 data sample accumulated with the Belle detector at the KEKB asymmetric-energy e+e- collider. The inclusive branching fraction is measured to be B(τ-→KS0X-ντ)=(9.15±0.01±0.15)×10-3, where X- can be anything; the exclusive branching fractions are B(τ-→π-KS0ντ)=(4.16±0.01±0.08)×10-3, B(τ-→K-KS0ντ)=(7.40±0.07±0.27)×10-4, B(τ-→π-KS0π0ντ)=(1.93±0.02±0.07)×10-3, B(τ-→K-KS0π0ντ)=(7.48±0.10±0.37)×10-4, B(τ-→π-KS0KS0ντ)=(2.33±0.03±0.09)×10-4, B(τ-→π-KS0KS0π0ντ)=(2.00±0.22±0.20)×10-5, where the first uncertainty is statistical and the second is systematic. For each mode, the accuracy is improved over that of pre-B-factory measurements by a factor ranging from five to ten. In τ-→π-KS0KS0π0ντ decays, clear signals for the intermediate states τ-→π-f1(1285)ντ and τ-→K*-KS0π0ντ are observed.
- Publication:
-
Physical Review D
- Pub Date:
- April 2014
- DOI:
- 10.1103/PhysRevD.89.072009
- arXiv:
- arXiv:1402.5213
- Bibcode:
- 2014PhRvD..89g2009R
- Keywords:
-
- 13.25.-k;
- 13.35.Dx;
- 14.60.Fg;
- Hadronic decays of mesons;
- Decays of taus;
- Taus;
- High Energy Physics - Experiment
- E-Print:
- 17 pages, 18 figures, submitted to Phys. Rev. D