Diphoton and Dark Matter from Cascade Decay

TL;DR

This paper introduces a simplified model for heavy particle cascade decays producing diphoton signals, which could be linked to dark matter and tested via multi-photon or boson resonance signals at colliders.

Contribution

It presents a model-independent analysis of cascade decay scenarios that connect diphoton signals with dark matter candidates and collider phenomenology.

Findings

Allowed couplings for diphoton production are constrained.

Possible four-photon signals can test the scenario.

Dark matter relic density is consistent with the model.

Abstract

We propose a simplified model to study the possible new heavy diphoton resonance from cascade decay of a heavier particle at colliders, which may be related to the dark matter or other new physics beyond the standard model. Model-independent constraints and predictions on the allowed couplings for generating the observed diphoton data are studied in detail. We demonstrate that this scenario can be tested by the possible four-photon signal or the $WW/ZZ/Z\gamma$ resonances. Meanwhile, this cascade decay scenario also provides us with the dark matter candidates, which is consistent with the observed dark matter relic density.