Pseudoscalar Mass Effects in Decays of Taus with Three Pseudoscalar Mesons

Abstract

We study the effects of non-vanishing pseudoscalar masses in $τ$ decays into three mesons. The hadronic matrix elements are obtained by using the generalized structure of the chiral currents with nonvanishing pseudoscalar masses and implementing the low-lying resonances in the different channels. We demonstrate that suitable angular distributions are sensitive to the mass effects in the chiral Langrangian. Numerical results for the rele\-% vant structure functions are given for the decay modes $τ\rightarrow νπ^-π^-π^+$, $νK^-π^-π^+$ and $νK^-π^-K^+$.