The Diphoton Excess from an Exceptional Supersymmetric Standard Model

TL;DR

This paper proposes that the 750 GeV diphoton excess observed at the LHC can be explained by a scalar singlet within an exceptional supersymmetric standard model, involving exotic quarks and gauge symmetry breaking.

Contribution

It introduces a string-inspired ESSM model where a scalar singlet explains the diphoton excess, linking it to $U(1)'$ symmetry breaking and exotic particles.

Findings

Model can produce sufficient diphoton signal at LHC

Exotic quarks facilitate diphoton coupling

Wide resonance width is difficult to fit

Abstract

In this paper we explain the diphoton excess in the invariant mass M $\approx$ 750 GeV , claimed by the ATLAS and CMS collaborations at the run-2 LHC, as the signal of a scalar singlet in a string inspired exceptional supersymmetric standard model (ESSM). The scalar singlet might play a rule in the spontaneous breaking of the $U(1)^\prime$ gauge symmetry of the ESSM and couples to diphoton and/or gluon pair with the help of exotic quarks and Higgs-like supermultiplets, which are contained in the fundamental representation of the $E_6$ group. The model might give rise to a large enough production cross section at the LHC but can hardly fit with the wide width of the resonance except in the strong couple regime.