Higgs -> $\gamma\gamma$, $Z\gamma$ in the Inert Doublet Model

Understand

An analysis of the Higgs boson decay rates to $\gamma\gamma$ and $Z\gamma$ in the Inert Doublet Model is presented.

• We study the correlation between the two rates and perform extended analysis of the two-photon rate ($R_{\gamma\gamma}$).
• We study both the possibility of enhancing and suppressing $R_{\gamma\gamma}$ and find constraints for masses of the scalar particles (in particular the dark matter (DM) candidate and the charged scalar) and their couplings to the Higgs boson.
• We also combine the resulting constraints with those following from the WMAP measurements of the DM relic density, obtaining stringent constraints on different dark matter scenarios.