Precise measurement of hadronic τ-decays with an η meson
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Volume
672
Journal Issue
3
Pages
209-218
Date Issued
2009
Author(s)
Inami, K. et al.
Abstract
We have studied hadronic τ decay modes involving an η meson using 490 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. The following branching fractions have been measured: B (τ- → K- η ντ) = (1.58 ± 0.05 ± 0.09) × 10- 4, B (τ- → K- π0 η ντ) = (4.6 ± 1.1 ± 0.4) × 10- 5, B (τ- → π- π0 η ντ) = (1.35 ± 0.03 ± 0.07) × 10- 3, B (τ- → π- KS0 η ντ) = (4.4 ± 0.7 ± 0.2) × 10- 5, and B (τ- → K* - η ντ) = (1.34 ± 0.12 ± 0.09) × 10- 4. These results are substantially more precise than previous measurements. The new measurements are compared with theoretical calculations based on the CVC hypothesis or the chiral perturbation theory. We also set upper limits on branching fractions for τ decays into K- KS0 η ντ, π- KS0 π0 η ντ, K- η η ντ, π- η η ντ and non-resonant K- π0 η ντ final states. © 2009.
Type
journal article