Dark Matter Theories in the Light of Diphoton Excess

Abstract: A new type of dark matter (DM) theories are proposed in the light of the standard model (SM) singlet scalar $\phi$ which is responsible for the diphoton excess at the LHC Run 2. In the so-called $\phi$-portal DM models, after taking into account the LHC constraints and DM direct detection limits, we show that in the perturbative framework DM as either a SM singlet scalar or Dirac fermion can be allowed in a wide mass range between 400 GeV and 3 TeV. The DM can be directly detected in SM multi-jets and missing energy.