2009/12/31 by Xiao-Gang He, Tong Li, Xue-Qian Li +2 · 3 citations
Physics and Astronomy · #Astrophysics #Branching fraction #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Higgs boson #Large Hadron Collider #Massive particle #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Scalar (mathematics) #Scalar field dark matter #Standard Model (mathematical formulation) #Statistics #WIMP #Weakly interacting massive particles #astro-ph.CO #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2010.04.026
published as Phys.Lett.B688:332-336,2010 · 10 pages, 5 figures; results updated with WMAP7 input, references added, conclusions unchanged, to match published version
openalex publication_date 2010/04/15 · arxiv created 2010/04/28 · arxiv updated 2010/05/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The direct-search experiment for dark matter performed by the CDMS II Collaboration has observed two candidate events. Although these events cannot be interpreted as significant evidence for the presence of weakly interacting massive particle (WIMP) dark matter (DM), the total CDMS II data have led to an improved upper-limit on the WIMP-nucleon spin-independent cross-section. We study some implications of these results for the simplest WIMP DM model, the SM+D, which extends the standard model (SM) by the addition of a real SM-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 the model, a large part of the parameter space is still allowed. We obtain strong correlations among the darkon mass, darkon–nucleon cross-section, mass of the Higgs boson, and branching ratio of its invisible decay. We point out that measurements of the Higgs invisible branching-ratio at the LHC can lift some possible ambiguities in determining the darkon mass from direct DM searches.