Minimal Left-Right Symmetry Confronted with the 750 GeV Di-photon Excess at LHC

TL;DR

This paper investigates whether the minimal left-right symmetric model can explain the 750 GeV di-photon excess observed at the LHC, exploring Higgs decay mechanisms and model variations.

Contribution

It analyzes the minimal left-right symmetric model's ability to account for the 750 GeV di-photon excess and proposes a variation with universal seesaw for fermion masses.

Findings

The minimal model's Higgs decay cannot fully explain the excess.

A variation with universal seesaw can potentially account for the observed signal.

The cross-section predictions are inconsistent with experimental results in the minimal model.

Abstract

The recent results of 13 TeV ATLAS and CMS di-photon searches show an excess at di-photon invariant mass of 750 GeV. We look for possible explanation of this within minimal left right symmetric model (MLRSM). The possible candidate is a neutral Higgs of mass 750 GeV that can decay to di-photon via charged Higgs and right handed gauge boson loop. However, the cross-section is not consistent with the ATLAS and CMS results. We then discuss one possible variation of this model with universal seesaw for fermion masses that can explain this excess.