Composite Inelastic Dark Matter

Details Composite Inelastic Dark Matter Composite Inelastic Dark Matter

2009-03-24

arxiv.org/abs/0903.3945v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages (two-column), 1 figure, revised version, references added

Scientific paper

Peaking consistently in June for nearly eleven years, the annual modulation signal reported by DAMA/NaI and DAMA/LIBRA offers strong evidence for the identity of dark matter. DAMA's signal strongly suggest that dark matter inelastically scatters into an excited state split by O(100 keV). We propose that DAMA is observing hyperfine transitions of a composite dark matter particle. As an example, we consider a meson of a QCD-like sector, built out of constituent fermions whose spin-spin interactions break the degeneracy of the ground state. An axially coupled U(1) gauge boson that mixes kinetically with hypercharge induces inelastic hyperfine transitions of the meson dark matter that can explain the DAMA signal.

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