Orbifold GUT model with nine Higgs doublets

TL;DR

This paper presents a non-supersymmetric orbifold GUT model based on SU(5), featuring nine Higgs doublets and addressing key issues like proton decay and doublet-triplet splitting through extra-dimensional mechanisms.

Contribution

It introduces a modified SU(5) orbifold GUT with only 5-plet Higgs scalars, resulting in nine Higgs doublets and a unification scale around 5×10^{13} GeV, enhancing collider phenomenology.

Findings

Unification scale around 5×10^{13} GeV

Nine Higgs doublets with specific mass spectrum

Solution to proton decay and doublet-triplet splitting problems

Abstract

We describe a non-supersymmetric orbifold GUT based on SU(5) symmetry. It is a modification of Kawamura's 5-D orbifold GUT model. The difference lies in the choice of Higgs scalars as we have allowed only 5-plets of SU(5) in the GUT scale. This variant was originally proposed by Brahmachari and Raychoudhuri. Proton decay problem and the doublet triplet splitting problems are solved by extra dimensional mechanism. The unification scale is around $5.0 \times 10^{13}$ GeVs. In low energy there are nine Higgs doublets. One at the 100 GeV region and eight others degenerate at around 1.4 TeV. It is an attractive non-supersymmetric extension of standard model with very rich collider physics phenomenology.