del Amo Sanchez, P. et al. (2011) Studies of τ^{-}→ηK^{-}ν_{τ} and τ^{-}→ηπ^{-}ν_{τ} at BABAR and a search for a second-class current. Physical Review D, 83 (3). 032002. ISSN 1550-7998
Abstract

We report on analyses of tau lepton decays τ-→ηK-ντ and τ-→ηπ-ντ, with η→π+π-π0, using 470  fb-1 of data from the BABAR experiment at PEP-II, collected at center-of-mass energies at and near the Υ(4S) resonance. We measure the branching fraction for the τ-→ηK-ντ decay mode, B(τ-→ηK-ντ)=(1.42±0.11(stat)±0.07(syst))×10-4, and report a 95% confidence level upper limit for the second-class current process τ-→ηπ-ντ, B(τ-→ηπ-ντ)<9.9×10-5.

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