  Based on experimental data by the Bell Collaboration, we present a
phenomenological analysis of the angular distributions in tau- -->K_S pi-nu_tau
decay. Our study shows that the angular analysis could lead to some interesting
observables, and the future experimental investigation of these observables
might be very helpful in revealing the nature of the scalar components of the
decay. New physics contributions from the two-Higgs-doublet model to this decay
have also been examined.
