The 750 GeV diphoton excess in unified $SU(2)_L\times SU(2)_R\times SU(4)$ models from noncommutative geometry

TL;DR

This paper explores a possible explanation for the 750 GeV diphoton resonance observed at the LHC within a specific class of unified $SU(2)_L\times SU(2)_R\times SU(4)$ models derived from noncommutative geometry, which restricts the Higgs content and predicts new scalar particles.

Contribution

It demonstrates how the 750 GeV diphoton excess can be explained using a scalar singlet and colored scalars in NCG-based unified models, highlighting the models' rigidity and predictive power.

Findings

The diphoton resonance can be explained by a scalar singlet and colored scalars.

The models' Higgs content is uniquely determined by NCG, reducing arbitrariness.

Implications for physics beyond the Standard Model are discussed.

Abstract

We discuss a possible interpretation of the $750$ GeV diphoton resonance, recently reported at the LHC, within a class of $SU(2)_L\times SU(2)_R\times SU(4)$ models with gauge coupling unification. The unification is imposed by the underlying non-commutative geometry (NCG), which in these models is extended to a left-right symmetric completion of the Standard Model (SM). Within such \textit{unified} $SU(2)_L\times SU(2)_R\times SU(4)$ models the Higgs content is restrictively determined from the underlying NCG, instead of being arbitrarily selected. We show that the observed cross sections involving the $750$ GeV diphoton resonance could be realized through a SM singlet scalar field accompanied by colored scalars, present in these unified models. In view of this result we discuss the underlying rigidity of these models in the NCG framework and the wider implications of the NCG approach for physics beyond the SM.