The Di-Photon Excess in a Perturbative SUSY Model

TL;DR

This paper demonstrates that the 750 GeV di-photon excess can be explained within the Minimal Dirac Gaugino Supersymmetric Standard Model without additional ad-hoc states, by analyzing scalar mixing, stability, and perturbativity constraints.

Contribution

It shows that the di-photon excess can be reproduced in the MDGSSM through the scalar partner of the Dirac bino, considering previously overlooked trilinear couplings and detailed constraints.

Findings

Identified parameter regions consistent with the excess and constraints.

Highlighted the importance of trilinear couplings in the model.

Confirmed the model's viability without new ad-hoc states.

Abstract

We show that a 750 GeV di-photon excess as reported by the ATLAS and CMS experiments can be reproduced by the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM) without the need of any ad-hoc addition of new states. The scalar resonance is identified with the spin-0 partner of the Dirac bino. We perform a thorough analysis of constraints coming from the mixing of the scalar with the Higgs boson, the stability of the vacuum and the requirement of perturbativity of the couplings up to very high energy scales. We exhibit examples of regions of the parameter space that respect all the constraints while reproducing the excess. We point out how trilinear couplings that are expected to arise in supersymmetry-breaking mediation scenarios, but were ignored in the previous literature on the subject, play an important role.