Model-independent determination of the Migdal effect via photoabsorption

Abstract

The Migdal effect in a dark-matter-nucleus scattering extends the direct search experiments to the sub-GeV mass region through electron ionization with sub-keV detection thresholds. In this paper, we derive a rigorous and model-independent "Migdal-photoabsorption" relation that links the sub-keV Migdal process to photoabsorption. This relation is free of theoretical uncertainties as it only requires the photoabsorption cross section as the experimental input. Validity of this relation is explicitly checked in the case of xenon with an state-of-the-arts atomic calculation that is well-benchmarked by experiments. The predictions based on this relation for xenon, argon, semiconductor silicon and germanium detectors are presented and discussed.

arXiv comment6 pages, 3 figures

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• Cosmic-ray upscattered inelastic dark matter
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• Accelerating Composite Dark Matter Discovery with Nuclear Recoils and the Migdal Effect
• Low-mass inelastic dark matter direct detection via the Migdal effect
• Present and future status of light dark matter models from cosmic-ray electron upscattering
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• Precise predictions and new insights for atomic ionisation from the Migdal effect
• A Search for Low-mass Dark Matter via Bremsstrahlung Radiation and the Migdal Effect in SuperCDMS
• The MIGDAL experiment: Measuring a rare atomic process to aid the search for dark matter
• Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect
• The Migdal Effect in Semiconductors for Dark Matter with Masses below $\sim$100 MeV
• The Molecular Migdal Effect
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• Can sub-GeV dark matter coherently scatter on the electrons in the Atom?
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• The Migdal effect in solid crystals and the role of non-adiabaticity
• Comparison of the Migdal transition probabilities in electron-atom inelastic cross sections
• Revisiting the Dark Matter Interpretation of Excess Rates in Semiconductors