  TauDecay is a library of helicity amplitudes to simulate polarized tau
decays, constructed in the FeynRules and MadGraph5 framework. Together with the
leptonic mode, the decay library includes the main hadronic modes, \tau \to
\nu_{\tau}+\pi, 2\pi, and 3\pi, which are introduced as effective vertices by
using FeynRules. The model file allows us to simulate tau decays when the
on-shell tau production is kinematically forbidden. We also demonstrate that
all possible correlations among the decay products of pair-produced taus
through a Z boson and a scalar/pseudoscalar Higgs boson are produced
automatically. The program has been tested carefully by making use of the
standard tau decay library Tauola.
