Correcting \alpha_3(M_Z) in the NMSGUT

TL;DR

This paper demonstrates that superheavy threshold corrections in the NMSGUT can adjust the predicted strong coupling constant at the Z boson mass scale to match experimental values, while also raising the unification scale.

Contribution

It shows how superheavy threshold effects in the NMSGUT can reconcile the predicted and observed values of (M_Z) and modify the unification scale.

Findings

Corrects (M_Z) prediction to match experimental data

Raises the unification scale above the one-loop value

Shows viability of parameter space with these corrections

Abstract

We show that superheavy threshold corrections in the New Minimal Supersymmetric GUT based on the SO(10) Higgs system ${\bf{210\oplus 126\oplus {\bar {126}}\oplus 10 \oplus 120}} $ can comfortably correct the prediction for the value of $\alpha_3(M_Z)$ from the relatively large value predicted by the two loop RG equations to the central value determined by the current world average. The unification scale is raised above the one loop value over almost all of the viable parameter space.