Abstract
We report measurements of branching fractions of τ lepton decays to final states with a KS0 meson using a 669fb-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.
Original language | English |
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Article number | 072009 |
Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volume | 89 |
Issue number | 7 |
DOIs | |
State | Published - 9 Apr 2014 |