Decoupling Can Revive Minimal Supersymmetric SU(5)

TL;DR

This paper shows that by decoupling heavy sfermions in minimal supersymmetric SU(5), proton decay constraints can be satisfied, making the model viable and testable in future experiments.

Contribution

It demonstrates that heavy sfermions can revive the minimal supersymmetric SU(5) model by evading proton decay constraints while maintaining gauge unification and dark matter candidates.

Findings

Proton lifetime can be extended beyond previous limits with heavy sfermions.

The model naturally explains the 126GeV Higgs boson.

Proton decay rates may be observable in future experiments.

Abstract

We revisit proton decay via the color-triplet Higgs multiplets in the minimal supersymmetric grand unified model with heavy sfermions. Although the model has been believed to be excluded due to the too short lifetime of proton, we have found that it is possible to evade the experimental constraints on the proton decay rate if the supersymmetric particles have masses much heavier than the electroweak scale. With such heavy sfermions, the 126GeV Higgs boson is naturally explained, while they do not spoil the gauge coupling unification and the existence of dark matter candidates. Since the resultant proton lifetime lies in the regions which may be reached in the future experiments, proton decay searches may give us a chance to verify the scenario as well as the supersymmetric grand unified models.