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The direct-search experiment for dark matter performed by the CDMS IICollaboration has observed two candidate events. Although these events cannotbe interpreted as significant evidence for the presence of weakly interactingmassive particle (WIMP) dark matter (DM), the total CDMS II data have led to animproved upper-limit on the WIMP-nucleon spin-independent cross-section. Westudy some implications of these results for the simplest WIMP DM model, theSM+D, which extends the standard model (SM) by the addition of a realSM-singlet scalar field dubbed darkon to play the role of the DM. We find that,although the CDMS II data rule out a sizable portion of parameter space of themodel, a large part of the parameter space is still allowed. We obtain strongcorrelations among the darkon mass, darkon-nucleon cross-section, mass of theHiggs boson, and branching ratio of its invisible decay. We point out thatmeasurements of the Higgs invisible branching-ratio at the LHC can lift somepossible ambiguities in determining the darkon mass from direct DM searches.

The Simplest Dark-Matter Model, CDMS II Results, and Higgs Detection at LHC