Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-02
JHEP 1105:026,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages LaTeX, 1 eps figure, 6 tables. Version accepted for publication in JHEP
Scientific paper
10.1007/JHEP05(2011)026
In a recent paper by Hooper and Goodenough, data from the Fermi Gamma Ray Telescope was analyzed and an excess of gamma rays was claimed to be found in the emission spectrum from the Galactic Center Region. Hooper and Goodenough suggest that the claimed excess can be well explained by 7-10 GeV annihilating dark matter with a power law density profile if the dark matter annihilates predominantly to tau pairs. In this paper we present such a dark matter model by extending the MSSM to include four Higgs doublets and one scalar singlet. A Z2 symmetry is imposed that enforces a Yukawa structure so that the up quarks, down quarks, and leptons each receive mass from a distinct doublet. This leads to an enhanced coupling of scalars to leptons and allows the model to naturally achieve the required phenomenology in order to explain the gamma ray excess. Our model yields the correct dark matter thermal relic density and avoids collider bounds from measurements of the Z width as well as direct production at LEP.
Marshall Gardner
Primulando Reinard
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