Gauge coupling unification in a classically scale invariant model

TL;DR

This paper presents a classically scale invariant extension of the Standard Model that achieves gauge coupling unification at high energies and addresses multiple fundamental issues like neutrino masses, dark matter, and baryogenesis.

Contribution

It introduces a model extending the Standard Model around the TeV scale that unifies gauge couplings and explains several cosmological and particle physics phenomena.

Findings

Achieves gauge coupling unification at the UV scale.

Predicts vector-like fermions below 1 TeV.

Identifies a Majorana dark matter candidate below 2.6 TeV.

Abstract

There are a lot of works within a class of classically scale invariant model, which is motivated by solving the gauge hierarchy problem. In this context, the Higgs mass vanishes at the UV scale due to the classically scale invariance, and is generated via the Coleman-Weinberg mechanism. Since the mass generation should occur not so far from the electroweak scale, we extend the standard model only around the TeV scale. We construct a model which can achieve the gauge coupling unification at the UV scale. In the same way, the model can realize the vacuum stability, smallness of active neutrino masses, baryon asymmetry of the universe, and dark matter relic abundance. The model predicts the existence vector-like fermions charged under $SU(3)_C$ with masses lower than $1\,{\rm TeV}$, and the SM singlet Majorana dark matter with mass lower than $2.6\,{\rm TeV}$.