Predictions for the proton lifetime in minimal nonsupersymmetric SO(10) models: An update

Abstract

We present our best estimates of the uncertainties due to heavy particle threshold corrections on the unification scale ${\mathit{M}}_{\mathit{U}}$, intermediate scale ${\mathit{M}}_{\mathit{I}}$, and coupling constant ${\mathrm{\ensuremath{\alpha}}}_{\mathit{U}}$ in the minimal nonsupersymmetric SO(10) models. Using recent data from the CERN ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ collider LEP on ${\mathrm{sin}}^{2}$${\mathrm{\ensuremath{\theta}}}_{\mathit{W}}$ and ${\mathrm{\ensuremath{\alpha}}}_{\mathrm{strong}}$ to obtain the two-loop-level predictions for ${\mathit{M}}_{\mathit{U}}$ and ${\mathrm{\ensuremath{\alpha}}}_{\mathit{U}}$, we update the predictions for the proton lifetime in minimal nonsupersymmetric SO(10) models.