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It was shown recently that mirror fermions, naturally present in a number ofdirections for new physics, seem to require an inert scalar doublet in order topass the electroweak precision tests. This provides a further motivation forconsidering the inert doublet as a dark matter candidate. Moreover, thepresence of extra families enhances the Standard Model Higgs-nucleon coupling,which has crucial impact on the Higgs and dark matter searches. We study thelimits on the inert dark matter mass in view of recent Xenon100 data. We findthat the mass of the inert dark matter must lie in a very narrow window 74-76GeV while the Higgs must weigh more than 400 GeV. For the sake of completenesswe discuss the cases with fewer extra families, where the possibility of alight Higgs boson opens up, enlarging the dark matter mass window to m_h/2-76GeV. We find that Xenon100 constrains the DM-Higgs interaction, which in turnimplies a lower bound on the monochromatic gamma-ray flux from DM annihilationin the galactic halo. For the mirror case, the predicted annihilation crosssection lies a factor of 4-5 below the current limit set by Fermi LAT, thusproviding a promising indirect detection signal.

Inert Doublet Dark Matter and Mirror/Extra Families after Xenon100