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

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

2009-12-23

arxiv.org/abs/0912.4722v3

Phys.Lett.B688:332-336,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures; results updated with WMAP7 input, references added, conclusions unchanged, to match published version

Scientific paper

10.1016/j.physletb.2010.04.026

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.

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