Pseudoscalar Mass Effects in Decays of Taus with Three Pseudoscalar Mesons

Abstract

We study the effects of non-vanishing pseudoscalar masses in $\tau$ 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 $\tau\rightarrow \nu\pi^-\pi^-\pi^+$, $\nu K^-\pi^-\pi^+$ and $\nu K^-\pi^-K^+$.