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arXiv · 2310.02316

Low-Energy Compton Scattering in Materials

Rouven Essig·Yonit Hochberg·Yutaro Shoji·Aman Singal·Gregory Suczewski
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Abstract

Low-energy Compton scattering is an important background for sub-GeV dark matter direct-detection and other experiments. Current Compton scattering calculations typically rely on assumptions that are not valid in the low-energy region of interest, beneath ~ 50 eV. Here we relate the low-energy Compton scattering differential cross section to the dielectric response of the material. Our new approach can be used for a wide range of materials and includes all-electron, band structure, and collective effects, which can be particularly relevant at low energies. We demonstrate the strength of our approach in several solid-state systems, in particular Si, Ge, GaAs, and SiC, which are relevant for current and proposed experiments searching for dark matter, neutrinos, and millicharged particles.

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Rouven Essig, Yonit Hochberg, Yutaro Shoji, Aman Singal, Gregory Suczewski. 2023-10-03. Low-Energy Compton Scattering in Materials. https://arxiv.org/abs/2310.02316

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