ar X iv : 0 80 8 . 16 45 v 1 [ he p - ph ] 1 2 A ug 2 00 8 Update analysis of τ − → V P − ν τ : Theory and Experiment

Within the resonance chiral theory (RχT), we have studied the process of a tau lepton decaying into a vector resonance plus a pseudo-Goldstone meson and a tau neutrino. Two kinds of processes are discussed: (a) τ− → (ρπ, ωπ−, φπ,KK)ντ , belonging to ∆S = 0 processes and (b) ∆S = 1 processes, such as τ− → (ρK, ωK−, φK−,K ∗0 π−)ντ . To fit the τ − → ωπ−ντ spectral function and the decay distribution of τ− → ωK−ντ to get unknown resonance couplings, we then make a prediction for branching ratios of all channels.