Abstract
Abstract
A statistically significant excess of gamma rays has been reported and robustly confirmed in the Galactic Center over the past decade. Large local dark matter densities suggest that this Galactic Center Excess (GCE) may be attributable to new physics, and indeed it has been shown that this signal is well-modelled by annihilations dominantly into $$ b\overline{b} $$
b
b
¯
with a WIMP-scale cross section. In this paper, we consider Majorana dark matter annihilating through a Higgs portal as a candidate source for this signal, where a large CP-violation in the Higgs coupling may serve to severely suppress scattering rates. In particular, we explore the phenomenology of two UV completions, a singlet-doublet model and a doublet-triplet model, and map out the available parameter space which can give a viable signal while respecting current experimental constraints.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference114 articles.
1. Fermi-LAT collaboration, Fermi-LAT Observations of High-Energy γ-Ray Emission Toward the Galactic Center, Astrophys. J. 819 (2016) 44 [arXiv:1511.02938] [INSPIRE].
2. L. Goodenough and D. Hooper, Possible Evidence For Dark Matter Annihilation In The Inner Milky Way From The Fermi Gamma Ray Space Telescope, arXiv:0910.2998 [INSPIRE].
3. D. Hooper and L. Goodenough, Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope, Phys. Lett. B 697 (2011) 412 [arXiv:1010.2752] [INSPIRE].
4. D. Hooper and T. Linden, On The Origin Of The Gamma Rays From The Galactic Center, Phys. Rev. D 84 (2011) 123005 [arXiv:1110.0006] [INSPIRE].
5. C. Gordon and O. Macias, Dark Matter and Pulsar Model Constraints from Galactic Center Fermi-LAT Gamma Ray Observations, Phys. Rev. D 88 (2013) 083521 [Erratum ibid. 89 (2014) 049901] [arXiv:1306.5725] [INSPIRE].
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