Renormalization Group Running of Fermion Observables in an Extended Non-Supersymmetric SO(10) Model

Understand

We investigate the renormalization group evolution of fermion masses, mixings and quartic scalar Higgs self-couplings in an ${\it extended}$ non-supersymmetric SO(10) model, where the Higgs sector contains the ${\bf 10}_{\rm H}$, ${\bf 120}_{\rm H}$, and ${\bf 126}_{\rm H}$ representations.

• The group SO(10) is spontaneously broken at the GUT scale to the Pati-Salam group and subsequently to the Standard Model (SM) at an intermediate scale $M_{\rm I}$.
• We explicitly take into account the effects of the change of gauge groups in the evolution.
• In particular, we derive the renormalization group equations for the different Yukawa couplings.