Probing Multicomponent Extension of Inert Doublet Model with a Vector Dark Matter

Abstract

Although theoretically well-motivated as a minimal consistent Dark Matter (DM) model, the Inert Doublet Model (IDM) fell short in explaining the existence of DM in the intermediate mass region ($100-500$ GeV). We try to address this problem by introducing an additional vector dark matter. We show that the relic density of inert dark matter candidate can be enhanced significantly with new interactions in the intermediate mass region $100-500$ GeV in the multicomponent dark matter model when compared with the usual single component inert doublet model. We also show that we can get a reasonable excess in the $/E_T$ distribution if we do not apply a very hard $/E_T$ cut on it as is customary in any dark matter search at the LHC.

15 pages, 13 figures, 4 tables, discussions updated, appendix added, typos corrected