Two-portal Dark Matter

TL;DR

This paper introduces a two-portal dark matter model where fermionic dark matter interacts via Higgs and vector portals, satisfying experimental constraints and potentially explaining the Fermi-LAT gamma-ray excess.

Contribution

It presents a renormalizable two-portal dark matter model with leptophobic interactions, expanding the viable dark matter mass range and explaining gamma-ray excess.

Findings

Dark matter mass can range from a few GeV to 1 TeV.

Model satisfies constraints from LUX, XENON100, WMAP, Planck, and LHC.

A 34 GeV dark matter candidate explains the Fermi-LAT gamma-ray excess.

Abstract

We propose a renormalizable dark matter model in which a fermionic dark matter (DM) candidate communicates with the standard model particles through two distinct portals: Higgs and vector portals. The dark sector is charged under a $U(1)'$ gauge symmetry while the standard model has a leptophobic interaction with the dark vector boson. The leading contribution of DM-nucleon elastic scattering cross section begins at one-loop level. The model meets all the constraints imposed by direct detection experiments provided by LUX and XENON100, observed relic abundance according to WMAP and Planck, and the invisible Higgs decay width measured at the LHC. It turns out that the dark matter mass in the viable parameter space can take values from a few GeV up to 1 TeV. This is a new feature which is absent in the models with only one portal. In addition, we can find in the constrained regions of the parameter space a DM mass of $\sim 34$ GeV annihilating into $b$ quark pair, which explains the Fermi-LAT gamma-ray excess.