Abstract
In the WIMP scenario, there is a one-to-one relation between the dark matter (DM) relicdensity and spin-independent direct detection rate if both the annihilation of DM and itselastic scattering on nuclei go dominantly through Higgs exchange. In particular, for DMmasses much smaller than the Higgs boson mass, the ratio of the relevant cross sectionsdepends only on the DM mass. Assuming DM mass and direct detection rate within theranges allowed by the recent DAMA collaboration results—taking account of thechannelling effect on energy threshold and the null results of the other direct detectionexperiments—gives a definite range for the relic density. For scalar DM models, like theHiggs portal models or the inert doublet model, the relic density range turns out to be inagreement with WMAP. This scenario implies that the Higgs boson has a large branchingratio to pairs of DM particles, a prediction which might challenge its search at theLHC.
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