Direct Detection of Light "Ge-phobic" Exothermic Dark Matter

Abstract

We present comparisons of direct dark matter (DM) detection data for light WIMPs with exothermic scattering with nuclei (exoDM), both assuming the Standard Halo Model (SHM) and in a halo model - independent manner. Exothermic interactions favor light targets, thus reducing the importance of upper limits derived from xenon targets, the most restrictive of which is at present the LUX limit. In our SHM analysis the CDMS-II-Si and CoGeNT regions become allowed by these bounds, however the recent SuperCDMS limit rejects both regions for exoDM with isospin-conserving couplings. An isospin-violating coupling of the exoDM, in particular one with a neutron to proton coupling ratio of $-0.8$ (which we call "Ge-phobic"), maximally reduces the DM coupling to germanium and allows the CDMS-II-Si region to become compatible with all bounds. This is also clearly shown in our halo-independent analysis.

14 pages, 10 figures

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Cited by in corpus (12)

• Extending two-Higgs-doublet models by a singlet scalar field - the Case for Dark Matter
• Quantifying (dis)agreement between direct detection experiments in a halo-independent way
• On the Direct Detection of Dark Matter Annihilation
• A systematic halo-independent analysis of direct detection data within the framework of Inelastic Dark Matter
• Light mediators in dark matter direct detections
• Assessing Compatibility of Direct Detection Data: Halo-Independent Global Likelihood Analyses
• TASI 2014 Lectures: The Hunt for Dark Matter
• Target dependence of the annual modulation in direct dark matter searches
• Halo-Independent Dark Matter Electron Scattering Analysis with In-Medium Effects
• Inverted dipole feature in directional detection of exothermic dark matter
• Effective scalar four-fermion interaction for Ge-phobic exothermic dark matter and the CDMS-II Silicon excess
• Halo-Independent analysis of direct dark matter detection data for any WIMP interaction