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We consider a non-supersymmetric $E_6$ Grand Unified Theory (GUT) withintermediate trinification symmetry $SU(3)_C \times SU(3)_L \times SU(3)_R\times D$ (D denoted as D-parity for discrete left-right symmetry) and studythe effect of one-loop threshold corrections arising due to every class ofsuperheavy particles (scalars, fermions and vectors). It is observed that, theintermediate mass scale $M_I$ and $\sin^2\theta_W$ remain unaffected by GUTthreshold contributions. The threshold modified unification mass scale $M_U$ isin excellent agreement with the present experimental proton decay constraint.The novel feature of the model is that GUT threshold uncertainty of $M_U$ isfound to be controlled by superheavy scalars only, leading to a very predictivescenario for proton decay, which can be verifiable within the foreseeableexperiments.

Threshold effects on prediction for proton decay in non-supersymmetric $E_6$ GUT with intermediate trinification symmetry