Halo-Independent Dark Matter Electron Scattering Analysis with In-Medium Effects

Abstract

Dark matter (DM)-electron scattering is a prime target of a number of direct DM detection experiments and constitutes a promising avenue for exploring interactions of DM in the sub-GeV mass-range, challenging to probe with nuclear recoils. We extend the recently proposed halo-independent analysis method for DM-electron scattering, which allows to infer the local DM halo properties without any additional assumptions about them, to include in-medium effects through dielectric functions of the target material. We show that in-medium effects could significantly affect halo-independent analysis response functions for germanium and silicon and thus are essential for proper inference of local DM halo characteristics from direct DM detection data.

arXiv comment9 pages, 5 figures

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• Wavelet-Harmonic Integration Methods
• The Revival of $U(1{)}_{L_e-L_{\mu }}$: A Natural Solution for $(g-2{)}_{\mu }$ with a Sub-GeV Dark Matter
• Partial Rate Matrix for Dark Matter Scattering
• The linear response theory approach to the sub-GeV dark matter in the Sun
• Information divergences to parametrize astrophysical uncertainties in dark matter direct detection
• Extracting Halo Independent Information from Dark Matter Electron Scattering Data
• Information-theoretic astrophysical uncertainties in the effective theory of dark matter direct detection