Multi-Higgs portal dark matter under the CDMS II results

Understand

In a scenario of Higgs portal dark matter, Higgs exchange processes are essential for both dark matter annihilation in the early Universe and direct search experiments.

• The CDMS II collaboration has recently released their final results on direct dark matter searches.
• We study a scalar dark matter model with multi-Higgs doublets under the constraint from the CDMS II results and also from the WMAP data.
• We find that the possible maximal value for the branching ratio of the invisible decay of the Higgs boson can be significantly greater than that in the Higgs portal model with one Higgs doublet, in particular, for the case of the so-called Type-X Yukawa interaction.