The 750 GeV diphoton excess from the goldstino superpartner

TL;DR

This paper proposes that the 750 GeV diphoton excess observed at the LHC can be explained by the sgoldstino scalar, the superpartner of the goldstino, with specific production and decay properties consistent with supersymmetry breaking.

Contribution

It introduces a supersymmetric model where the sgoldstino explains the diphoton excess, linking it to the supersymmetry breaking scale and gaugino masses, and discusses implications for Higgs mass.

Findings

The sgoldstino can produce the observed diphoton excess at 750 GeV.

The supersymmetry breaking scale is constrained to a few TeV.

The model predicts narrow widths for the scalars, with possible mass splitting of 10-30 GeV.

Abstract

We interpret the di-photon excess recently reported by the ATLAS and CMS collaborations as a new resonance arising from the sgoldstino scalar, which is the superpartner of the Goldstone mode of spontaneous supersymmetry breaking, the goldstino. The sgoldstino is produced at the LHC via gluon fusion and decays to photons, with interaction strengths proportional to the corresponding gaugino masses over the supersymmetry breaking scale. Fitting the excess, while evading bounds from searches in the di-jet, $Z\gamma$, $ZZ$ and $WW$ final states, selects the supersymmetry breaking scale to be a few TeV, and particular ranges for the gaugino masses. The two real scalars, corresponding to the CP-even and CP-odd parts of the complex sgoldstino, both have narrow widths, but their masses can be split of the order 10-30 GeV by electroweak mixing corrections, which could account for the preference of a wider resonance width in the current low-statistics data. In the parameter space under consideration, tree-level $F$-term contributions to the Higgs mass arise, in addition to the standard $D$-term contribution proportional to the $Z$-boson mass, which can significantly enhance the tree level Higgs mass.