ATLAS diboson excess from low scale supersymmetry breaking

TL;DR

This paper interprets the ATLAS diboson excess as a signal from a sgoldstino scalar in low-scale supersymmetry breaking models, predicting observable signals in future LHC runs.

Contribution

It proposes a novel supersymmetric explanation for the ATLAS diboson excess involving the sgoldstino scalar, linking it to specific SUSY breaking parameters and making testable predictions.

Findings

The excess can be explained by a sgoldstino scalar coupling to vector bosons.

Predicted Zγ final state rate is observable at LHC Run II.

Specific gaugino mass relations are favored by the excess interpretation.

Abstract

We provide an interpretation of the recent ATLAS diboson excess in terms of a class of supersymmetric models in which the scale of supersymmetry (SUSY) breaking is in the few TeV range. The particle responsible for the excess is the scalar superpartner of the Goldstone fermion associated with SUSY breaking, the sgoldstino. This scalar couples strongly to the Standard Model vector bosons and weakly to the fermions, with all coupling strengths determined by ratios of soft SUSY breaking parameters over the SUSY breaking scale. Explaining the ATLAS excess selects particular relations and ranges for the gaugino masses, while imposing no constraints on the other superpartner masses. Moreover, this signal hypothesis predicts a rate in the $Z\gamma$ final state that is expected to be observable at the LHC Run II already with a few fb$^{-1}$ of integrated luminosity.