Alternative renormalizable minimal SO(10) GUT and the Seesaw Scale

Abstract

Alternative renormalizable minimal non-SUSY SO(10) GUT model is proposed. Instead of a $126$-dimensional Higgs field, a $120$-dimensional Higgs filed is ntroducedin addition to a $10$-dimensional Higgs field and plays a crucial role to reproduce the realistic charged fermion mass matrices. With contributions of $120$ Higgs field, the original Witten's scenario of inducing the right-handed Majorana neutrino mass through 2-loop diagrams becomes phenomenologically viable. This model inherits the nice features of the conventional renormalizable minimal SO(10) GUT model with $10+\overline{126}$ Higgs fields, while supplemented with a low scale seesaw mechanism due to the 2-loop induced right-handed Majorana neutrino mass. %

Comments: 12 pages, 1 figure, errors are corrected and references are added