Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-30
Phys.Lett.B685:313-317,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version published in Physics Letters B, 11 pages, 4 figures, added some comments
Scientific paper
10.1016/j.physletb.2010.02.005
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. Therefore, the search for the invisible decay of the Higgs boson at the CERN Large Hadron Collider and future collider experiments would provide useful information not only for the nature of dark matter but also for the structure of the Higgs sector even without directly detecting any extra scalar boson.
Aoki Mayumi
Kanemura Shinya
Seto Osamu
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