An optimistic CoGeNT analysis

Abstract

Inspired by a recently proposed model of millicharged atomic dark matter (MADM), we analyze several classes of light dark matter models with respect to CoGeNT modulated and unmodulated data, and constraints from CDMS, XENON10 and XENON100. After removing the surface contaminated events from the original CoGeNT data set, we find an acceptable fit to all these data (but with the modulating part of the signal making a statistically small contribution), using somewhat relaxed assumptions about the response of the null experiments at low recoil energies, and postulating an unknown modulating background in the CoGeNT data at recoil energies above 1.5 keVee. We compare the fits of MADM---an example of inelastic magnetic dark matter---to those of standard elastically and inelastically scattering light WIMPs (eDM and iDM). The iDM model gives the best fit, with MADM close behind. The dark matter interpretation of the DAMA annual modulation cannot be made compatible with these results however. We find that the inclusion of a tidal debris component in the dark matter phase space distribution improves the fits or helps to relieve tension with XENON constraints.

16 pages, 11 figures; v2: added discussion of dipole-dipole scattering and details of matrix elements; also implications of XENON100 2012 limits. Qualitative conclusions unchanged. Published version

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• Hidden Sector Hydrogen as Dark Matter: Small-scale Structure Formation Predictions and the Importance of Hyperfine Interactions
• Exothermic Double-Disk Dark Matter
• 3.5 keV X-rays as the "21 cm line" of dark atoms, and a link to light sterile neutrinos
• Minimal nonabelian model of atomic dark matter
• Constraints on dark photons from ${\pi }^0$ decays
• Decaying Dark Atom constituents and cosmic positron excess
• On self-gravitating strange dark matter halos around galaxies
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• Dark Sector spectroscopy at the ILC
• Non-collider searches for stable massive particles
• Bayesian analysis of multiple direct detection experiments
• Differentiating hidden sector dark matter from light WIMPs with Germanium detectors