The 750 GeV diphoton excess from the goldstino superpartner

Christoffer Petersson, Riccardo Torre

Published 2015-12-16Version 1

We interpret the diphoton excess recently reported by the ATLAS and CMS collaborations as a 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 other searches, 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 \mbox{10-30 GeV} by electroweak mixing corrections, thereby possibly accounting for the slight preference in the data for a wider resonance width. For the parameter space under consideration, additional tree level contributions to the Higgs mass arise, which can bring it up to 125 GeV even without including the stop loop contribution.