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The standard model (SM) plus a real gauge-singlet scalar field dubbed darkon(SM+D) is the simplest model possessing a weakly interacting massive particle(WIMP) dark-matter candidate. The upper limits for the WIMP-nucleon elasticcross-section as a function of WIMP mass from the recent XENON10 and CDMS-IIexperiments rule out darkon mass ranges from 10 to (50,70,75) GeV forHiggs-boson masses of (120,200,350) GeV, respectively. This may exclude thepossibility of the darkon providing an explanation for the gamma-ray excessobserved in the EGRET data. We show that by extending the SM+D to atwo-Higgs-doublet model plus a darkon the experimental constraints on theWIMP-nucleon interactions can be circumvented due to suppression occurring atsome values of the product tan(alpha)tan(beta), with alpha being theneutral-Higgs mixing angle and tan(beta) the ratio of vacuum expectation valuesof the Higgs doublets. We also comment on the implication of the darkon modelfor Higgs searches at the LHC.

Constraints on Scalar Dark Matter from Direct Experimental Searches