A 750 GeV Portal: LHC Phenomenology and Dark Matter Candidates

Understand

We study the effective field theory obtained by extending the Standard Model field content with two singlets: a 750 GeV (pseudo-)scalar and a stable fermion.

• Accounting for collider productions initiated by both gluon and photon fusion, we investigate where the theory is consistent with both the LHC diphoton excess and bounds from Run 1.
• We analyze dark matter phenomenology in such regions, including relic density constraints as well as collider, direct, and indirect bounds.
• Scalar portal dark matter models are very close to limits from direct detection and mono-jet searches if gluon fusion dominates, and not constrained at all otherwise.