Abstract
We consider a singlet Dirac fermion with Peccei-Quinn (PQ) symmetry as dark matter. A singlet complex scalar is introduced to mediate between dark matter and the Standard Model through Higgs portal interaction and electroweak PQ anomalies. We show that a resonant annihilation of dark matter with axion mediation can explain the monochromatic photon line of the Fermi Large Area Telescope data at 130 GeV by anomaly interactions while the annihilation cross section with Higgs portal interaction is $p$-wave suppressed. We discuss the interplay between the direct detection of the fermion dark matter and the collider search of Higgs-like scalars. We also present an ultraviolet completion of the dark matter model into the Next-to-Minimal Supersymmetric Standard Model with PQ symmetry.
Highlights
Dark matter (DM) is a dominant component of matter density in the Universe, occupying about five times larger than baryonic matter [1]
We show that a resonant annihilation of dark matter with axion mediation can explain the monochromatic photon line of the Fermi Large Area Telescope data at 130 GeV by anomaly interactions while the annihilation cross section with Higgs portal interaction is p-wave suppressed
We have shown the case with M 1⁄4 145 GeV on the right plot of Fig. 5 where both the Wilkinson microwave anisotropy probe (WMAP) bound and the gamma ray line are obtained in all the parameter space away from the CP-even scalar resonance at m2 $ 2M, and the direct detection bound is little changed as compared to the case M 1⁄4 130 GeV
Summary
Dark matter (DM) is a dominant component of matter density in the Universe, occupying about five times larger than baryonic matter [1]. We propose a new dark matter model to explain the branching fraction into monochromatic photons as indicated by the Fermi LAT data [9] and discuss the gamma ray constraints in the model. We show that the DM annihilation with axion mediation is a dominant channel in determining the relic density at freeze-out by a resonance effect, and it produces a monochromatic photon line by the DM annihilation into or Z with sizable branching fractions at present. We present the results of the DM relic density and the production mechanism of gamma ray line and discuss the direct detection constraint on the model. There are two appendices providing the details of the decay rates of the CP-even scalars and the axion, and the cross sections for dominant DM annihilation channels with axion and CP-even scalar mediations
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