Hi, a simple question on W boson vertices (and I guess field theory in general). If I have a W boson vertex for incoming particles, i.e. W^+ ubar d and W^- u dbar how do I change this for outgoing W's. The first interaction contains a CKM matrix element Vud and the second a Vud^*, and I want to figure out which one of them has the complex conjugate in the case of outgoing W's. Thanks!