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arXiv · 2309.09740

Probing Light DM through Migdal Effect with Spherical Proportional Counter

Yuchao Gu·Jie Tang·Lei Wu·Bin Zhu
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Abstract

Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter (SPC) with a single electron detection threshold can be utilized to search for sub-GeV dark matter (DM). In this work, we investigate the prospects for light DM direct detection through the DM-nucleus Migdal effect in the DARKSPHERE detector. We consider the different DM velocity distributions and momentum-transfer effects. For Xenon and Neon targets, we find that the DM mass $m_{DM}$ can be probed down to as low as $m_{DM} \sim \mathcal{O}$(10) MeV, and the derived bounds on the DM-nucleus scattering cross section $\bar{\sigma}_{n}$ are sensitive to the high-velocity tails of the DM velocity distribution, which can be altered by orders of magnitude for the different DM velocity distributions in the region $m_{DM} < 10$ MeV.

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Yuchao Gu, Jie Tang, Lei Wu, Bin Zhu. 2023-09-18. Probing Light DM through Migdal Effect with Spherical Proportional Counter. https://arxiv.org/abs/2309.09740

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