The LHC diphoton resonance and dark matter

Understand

A Higgs-like resonance with a mass of approximately 750 GeV has recently been observed at the LHC in its diphoton decay.

• If this state is not simply a statistical fluctuation which will disappear with more data, it will have important implications not only for particle physics but also for cosmology.
• In this note, we analyze the implications of such a resonance for the dark matter (DM).
• Assuming a spin 1/2 DM particle, we first verify that indeed the correct relic density can be obtain for a wide range of the particle mass and weak scale coupling that are compatible with present data.