Significant Gamma Lines from Inert Higgs Dark Matter
Abstract
If one has to explain dark matter by something else than supersymmetry, one of the most minimal solutions is adding another doublet of Higgs bosons. It has recently been noted, that if an unbroken discrete symmetry forbids the coupling to fermions of the new doublet, then the particle playing the role of the usual Higgs particle may naturally be very heavy, of the order of 500 GeV, without violating electroweak precision bounds. The lightest of the new scalar particles is a natural dark matter candidate, and for a mass between 10 and 80 GeV it can give the correct cosmic abundance as measured by WMAP. It would not yet have shown up in direct detection experiments, and for high Higgs masses also the indirect rates would seem rather small, in particular since tree-level processes giving W and Z final states are kinematically forbidden. However, we show that the loop-induced monochromatic \gamma\gamma and Z\gamma final states would be exceptionally strong for this dark matter candidate. The energy range and rates for these line processes make them ideal to search for in the soon upcoming GLAST satellite experiment.Keywords
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