Proton Stability, Dark Matter and Light Color Octet Scalars in Adjoint SU(5) Unification

TL;DR

This paper explores gauge unification in Adjoint SU(5), examining proton decay constraints, dark matter candidates, and the potential for discovering light color octet scalars at colliders.

Contribution

It provides a detailed allowed mass spectrum consistent with proton decay limits and discusses the phenomenological implications for dark matter and collider searches.

Findings

Proton decay lifetimes are constrained below experimental bounds.

Light scalar color octets are predicted and could be detected at the LHC.

The model remains compatible with current proton decay and dark matter observations.

Abstract

The unification of gauge interactions in the context of Adjoint SU(5) and its phenomenological consequences are investigated. We show the allowed mass spectrum of the theory which is compatible with proton decay, and discuss the possibility to have a cold dark matter candidate. Due to the upper bounds on the proton decay partial lifetimes, tau (p --> K^+ nubar) < 9.3 10^{36} years and tau(p --> pi^+ nubar) < 3.0 10^{35} years, the theory could be tested at future proton decay experiments. The theory predicts also light scalar color octets which could be produced at the Large Hadron Collider.