  We study some New Physics effects on the hadronic decays of the Top quark,
like t-> b bbar c, and on a forward-backward-like CP even asymmetry A_t
constructed in such a way that it is zero in the SM. We find that an anomalous
right-handed contribution of the effective tbW vertex may induce an asymmetry
A_t of the order of 20 %. A light W' boson with pure right handed couplings
tdW' may induce an asymmetry A_t of the same order of magnitude.
