Pseudoscalar Gluinonia to 750 GeV LHC Diphotons

TL;DR

This paper explores the possibility that the 750 GeV diphoton excess observed at the LHC could be due to pseudoscalar gluinonia, bound states of gluinos, by scanning supersymmetry parameters and simulating relevant events.

Contribution

It provides a detailed analysis of pseudoscalar gluinonia as an explanation for the 750 GeV diphoton excess, including parameter space exploration and event simulation.

Findings

Identified a viable supersymmetry parameter point consistent with the excess.

Demonstrated that an enhanced signal strength is needed beyond standard predictions.

Reproduced key features of the diphoton excess through simulation.

Abstract

Interpreting the diphoton mass excesses near 750~GeV reported by ATLAS and CMS as pseudoscalar gluinonia, bound states of two gluinos, we perform a scan in Next-to-Minimal Supersymmetry parameter space, fixing $m_{\tilde{g}}\approx 380$~GeV and identifying an experimentally viable point. We generate events with this point, perform fast simulation, and carry out an analysis modeled on the ATLAS search which reproduces features of the diphoton excess. This interpretation requires an enhancement of the signal strength above the nominal rate found in the literature and neglecting the gaugino mass unification constraint $M_{3}\approx 3M_{2}$.