Direct CP violation in semi-leptonic and leptonic decays

Abstract

We show that direct CP violation in semi-leptonic and leptonic decays can occur in multi-Higgs doublet extensions of the electroweak standard model with flavor changing neutral currents. For pion and lepton decays these $CP$ violating effects cannot be constrained directly by experimental data since up to now the branching ratio of the decays ${\pi }^{-}$ and ${\mu }^{-}$ have not been measured in laboratory.

Comments: 7 pages, Revtex, 3 eps figures