NMSGUT-III: Grand Unification upended

Understand

We show that matter yukawa couplings of the New Minimal Supersymmetric (SO(10)) GUT(NMSGUT) are subject to very significant GUT scale threshold corrections.

• Including these threshold effects relaxes the constraint $ y_b-y_\tau\simeq y_s-y_\mu$ operative in $\textbf{10} -\textbf{120} $plet generated tree level MSSM matter fermion yukawas $y_f$.
• We find accurate fits of the MSSM fermion mass-mixing data in terms of NMSGUT superpotential couplings and 5 independent soft Susy breaking parameters $M_0, M_{1/2}, A_0, M^2_{H,\bar{H}}$ at $M_X$.
• The fits generally have elevated unification scale $M_X$ near $M_{Planck}$, viable values of $\alpha_3(M_Z)$, and are consistent with current limits on B violation, $b\rightarrow s\gamma$, muon magnetic moment anomaly and Standard Model $\rho$ parameter.