Indirect signature of dark matter with the diphoton resonance at 750 GeV

Motivated by the recently reported diphoton resonance at 750 GeV, we study a new axion-like bosonic portal model of dark matter physics. When the resonance particle is identified as the pseudo-scalar mediator, via which the standard model sector would interact with the dark matter sector, the data from collider physics would provide profound implications to dark matter phenomenology. In this paper, we first identify the preferred parameter space of the suggested portal model from the results of the LHC run with root s = 13 TeV, and then we examine the dark matter signature taking into account the data from cosmic-ray experiments including Fermi-LAT dwarf galaxy gamma-ray search, HESS gamma-line search, and future CTA diffuse gamma-ray and gamma-line searches. (C) 2016 Elsevier B.V. All rights reserved.