Neutrino Masses and Leptogenesis with Heavy Higgs Triplets

Abstract

A simple and economical extension of the minimal standard electroweak gauge\nmodel (without right-handed neutrinos) by the addition of two heavy Higgs\nscalar triplets would have two significant advantages. \\underline {Naturally}\nsmall Majorana neutrino masses would become possible, as well as leptogenesis\nin the early universe which gets converted at the electroweak phase transition\ninto the present observed baryon asymmetry.\n