Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-02
JCAP 0910:018,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 7 figures. v2: minor changes and discussion on the embedding in SO(10) added. v3: matches the published version in J
Scientific paper
10.1088/1475-7516/2009/10/018
The annual modulation observed by DAMA/NaI and DAMA/Libra may be interpreted in terms of elastic or inelastic scattering of dark matter particles. In this paper we confront these two scenarios within the framework of a very simple extension of the Standard Model, the Inert Doublet Model (IDM). In this model the dark matter candidate is a scalar, the lightest component of an extra Higgs doublet. We first revisit the case for the elastic scattering of a light scalar WIMP, M_DM~10 GeV, a scenario which requires that a fraction of events in DAMA are channelled. Second we consider the possibility of inelastic Dark Matter (iDM). This option is technically natural in the IDM, in the sense that the mass splitting between the lightest and next-to-lightest neutral scalars may be protected by a Peccei-Quinn (PQ) symmetry. We show that candidates with a mass M_DM between ~535 GeV and ~50 TeV may reproduce the DAMA data and have a cosmic abundance in agreement with WMAP. This range may be extended to candidates as light as ~50 GeV if we exploit the possibility that the approximate PQ symmetry is effectively conserved and that a primordial asymmetry in the dark sector may survive until freeze-out.
Arina Chiara
Ling F.-S.
Tytgat Michel H. G.
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