Accepted Thursday Nov 05, 2009
Observing charge-parity (CP) or time-reversal (T) violations in the leptonic sector will give useful information to elucidate the nature of neutrinos. CP-violating couplings in charged leptonic currents carry out the weak phases necessary to break these symmetries. Here we study the interference of W and H bosons mediated amplitudes as the origin of possible CP and T violation in semileptonic decays of K mesons and t leptons. We use the experimental bound on the T-odd transverse polarization asymmetry in K+m3 decays to predict an upper limit on the CP violating effects in t K pn decays. In the framework of this model with scalar-mediated interactions, we find that current limits on the former process indicate that the CP violating effects in the latter are much smaller than the limits reported so far.