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The ATLAS and CMS collaborations recently reported a mild excess in thediphoton final state pointing to a resonance with a mass of around 750 GeV anda potentially large width. We consider the possibility of a scalar resonancebeing produced via gluon fusion and decaying to electroweak gauge bosons, jetsand pairs of invisible particles, stable at collider scales. We compute limitsfrom monojet searches on such a resonance and test their compatibility with therequirement for a large width. We also study whether the stable particle can bea a dark matter candidate and investigate the corresponding relic densityconstraints along with the collider limits. We show that monojet searches ruleout a large part of the available parameter space and point out scenarios wherea broad diphoton resonance can be reconciled with monojet constraints.

One jet to rule them all: monojet constraints and invisible decays of a 750 GeV diphoton resonance