750 GeV Diphoton Excess from the Goldstino Superpartner

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, Zγ, ZZ and W W 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.

The NMSSM lives: with the 750 GeV diphoton excess

“…New vector-like fermions and singlets have to be added to the particle spectrum of the MSSM in order to explain the diphoton excess [14][15][16][17][18]. Other SUSY solutions either involves R-parity violation [19,20] or assume a very low SUSY breaking scale [21][22][23].…”

750 GeV diphoton excess confronted with a top-pion in the TTM model

“…In this calculation, we have imposed the constraint in Eq. (12) and allowed M W ′ and M D to vary in the range [300, 1000] GeV. As one can see from Fig.…”

Precision tools and models to narrow in on the 750 GeV diphoton resonance

“…However, some of these interpretations are in tension with the non-observation of this resonance in other channels. In supersymmetry, the scalar partner of the goldstino could provide an explanation to the diphoton signal [97,147,167,335]. Other ideas, slightly more exotic, include: a model with a space-time varying electromagnetic coupling constant [135], Gluinonia [337], Squarkonium/Diquarkonium [299], flavons [244], axions in various incarnations [8,24,63,246,274,336], a natural Coleman-Weinberg theory [22,307], radiative neutrino mass models [264,325,327], and string-inspired models [19,132,188,240,254].…”