Abstract
A Z2 parity odd real scalar is a good candidate for dark matter in the present Universe. We consider models contain two Higgs doublet fields and one real scalar dark matter particle with mass in the range of 31 — 40 GeV and annihilating into a bb̄ pair, or with about 10 GeV mass and annihilating into tau lepton pair. Those annihilation modes suitably explain the observed excess of the gamma-ray flux from the Galactic Center. We identify the parameter region of the model that can fit the gamma-ray excess and satisfy phenomenological constraints, such as the observed dark matter relic density and the null results of direct dark matter search experiments. Most of the parameter region is found to be within the search reach of various future experiments.
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