Cosmic rays through the Higgs portal
Rainer Dick, Robert B. Mann, Kai E. Wunderle
TL;DR
This paper explores how electroweak singlet dark matter particles, coupled via the Higgs portal, can produce detectable gamma-ray signals through annihilation near the Higgs and gauge boson resonances.
Contribution
It analyzes the gamma-ray signatures of Higgs-portal dark matter with mass near the Higgs, highlighting potential observability in gamma-ray fluxes.
Findings
Gamma-ray flux from dark matter annihilation can reach several per mil of EGRET flux.
Annihilation is dominated by resonance effects near W, Z, and Higgs masses.
Detectable gamma-ray signals could provide evidence for Higgs-portal dark matter.
Abstract
We consider electroweak singlet dark matter with a mass comparable to the Higgs mass. The singlet is assumed to couple to standard matter through a perturbative coupling to the Higgs particle. The annihilation of a singlet with a mass comparable to the Higgs mass is dominated by proximity to the W, Z and Higgs peaks in the annihilation cross section. We find that the continuous photon spectrum from annihilation of a perturbatively coupled singlet in the galactic halo can reach a level of several per mil of the EGRET diffuse gamma ray flux.
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