Axion-mediated dark matter and Higgs diphoton signal

Abstract

We consider axion-mediated dark matter models motivated by Fermi gamma ray line at 130 GeV, where anomaly interactions of an axion-like scalar mediate a singlet Dirac fermion dark matter (DM) to electroweak gauge bosons. In these models, extra vector-like leptons generate anomaly interactions for the axion and can also couple to the SM Higgs boson to modify the Higgs-to-diphoton rate. We can distinguish models by the branching fraction of the DM annihilation into a photon pair, favoring the model with a triplet fermion. From the condition that the lighter charged extra lepton must be heavier than dark matter for no tree-level DM annihilations, we also show that the ratio of Higgs-to-diphoton rate to the SM value is constrained by vacuum stability to 1.4(1.5) for the cutoff scale of 10(1) TeV.

29 pages, 6 figures, references added

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Cited by in corpus (27)

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• A Model of Vector-like Leptons for the Muon $g-2$ and the $W$ Boson Mass
• An effective gauge-Higgs operators analysis of new physics associated with the Higgs
• Gamma-ray boxes from axion-mediated dark matter
• Multiple Gamma Lines from Semi-Annihilation
• Neutralino dark matter and the Fermi gamma-ray lines
• Gamma-ray lines and One-Loop Continuum from s-channel Dark Matter Annihilations
• Lepto-Quark Portal Dark Matter
• On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter
• Exothermic Dark Matter for XENON1T Excess
• Diphoton Decay Excess and 125 GeV Higgs Boson in Gauge-Higgs Unification
• Interplay between Fermi gamma-ray lines and collider searches
• $SU(2)\otimes SU(2)$ Gauge Extensions of the MSSM Revisited
• Vector Leptons in the Higgs Triplet Model
• Can New Colored Particles Illuminate the Higgs?
• Right Sneutrino Dark Matter and a Monochromatic Photon Line
• Gamma Rays from Top-Mediated Dark Matter Annihilations
• H to Z gamma in Gauge-Higgs Unification
• Seesaw lepton masses and muon $g-2$ from heavy vector-like leptons
• The $SU(2{)}_D$ lepton portals for muon $g-2$, $W$ boson mass and dark matter
• A Clustering Analysis of the Morphology of the 130 GeV Gamma-Ray Feature
• Vector Higgs-portal dark matter and Fermi-LAT gamma ray line
• Dichromatic Dark Matter
• Gamma Rays from Bino-like Dark Matter in the MSSM
• Flux-mediated Dark Matter