Implications of the diphoton excess on Left-Right models and gauge unification

TL;DR

This paper explores how the 750 GeV diphoton excess can be explained within left-right symmetric models extended with scalar singlets and vector-like fermions, impacting fermion masses, dark matter, and gauge unification.

Contribution

It proposes a minimal extension of LRSM with vector-like fermions and a real bi-triplet scalar, linking the diphoton excess to gauge unification and dark matter implications.

Findings

Gauge couplings unify at approximately 10^{17.7} GeV.

Vector-like fermions influence fermion masses and mixing.

The model provides a potential dark matter candidate.

Abstract

The recent diphoton excess signal at an invariant mass of 750 GeV can be interpreted in the framework of left-right symmetric models with additional scalar singlets and vector-like fermions. We propose a minimal scenario for such a purpose. Extending the LRSM framework to include these new vector-like fermionic fields, on the other hand, results in interesting phenomenological implications for the LRSM fermion masses and mixing. Furthermore, existence of such vector-like fermions can also have interesting implications for baryogenesis and the dark matter sector. The introduction of a real bi-triplet scalar which contains a potential DM candidate will allow the gauge couplings to unify at $\approx 10^{17.7}$ GeV.