Probing Scalar Dark Matter with Direct Experimental Searches and the LHC

Statistics – Applications

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Protons And Neutrons, Applications Of Electroweak Models To Specific Processes, Elastic Scattering, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Observational Cosmology, Lagrangian And Hamiltonian Approach

Scientific paper

The standard model (SM) plus a real gauge-singlet scalar field called darkon (SM+D) is the simplest model possessing a weakly interacting massive particle (WIMP) dark-matter candidate. The upper limits for the WIMP-nucleon elastic cross-section as a function of WIMP mass recently set by the direct-search experiments XENON10 and CDMS II rule out darkon mass ranges from 10 to (50, 70, 75) GeV for Higgs-boson masses of (120, 200, 350) GeV, respectively. This may exclude the possibility of the darkon providing an explanation for the gamma-ray excess observed in the EGRET data. It is shown that by extending the SM+D to a two-Higgs-doublet model plus a darkon the experimental constraints on the WIMP-nucleon interactions can be evaded due to suppression occurring in some of the parameter space of the model. Moreover, the darkon model can also be probed in Higgs-boson searches at the CERN Large Hadron Collider (LHC).

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