750 GeV Di-photon excess at CERN LHC from a dark sector assisted scalar decay

Abstract

We present a simple extension of the standard model (SM) to explain the diphoton excess, reported by CMS and ATLAS at CERN LHC. The SM is extended by a dark sector including a vector-like lepton doublet and a singlet of zero electromagnetic charge, which are odd under a $Z_2$ symmetry. These vector-like leptons assist the additional scalar, different from SM Higgs, to decay to di-photons of invariant mass around 750 GeV and thus explaining the excess observed at LHC. The admixture of neutral component of the vector-like lepton doublet and singlet constitute the dark matter component of the Universe. We show the relevant parameter space for correct relic density and direct detection of dark matter.

20 pages, 11 figures, accepted for publication in JCAP

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• Singlet-Doublet Fermionic Dark Matter, Neutrino Mass and Collider Signatures
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