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arXiv · 2203.06664

Detection of Inelastic Dark Matter via Electron Recoils in SENSEI

Yuchao Gu·Lei Wu·Bin Zhu
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Abstract

The low-threshold experiment SENSEI, which uses the ultralow-noise silicon Skipper-CCD to explore light dark matter from the halo, has achieved the most rigorous limitations on light DM-electron scattering cross section. In this work, we investigate the inelastic DM-electron scattering process with the SENSEI data and derive the constraints on the inelastic dark matter model with a $U(1)$ gauge boson as the mediator. Comparing with elastic scattering process, we find that the down-scattering process with the mass splitting $δ\equiv m_{χ_2}-m_{χ_1}<0$ is more strongly constrained while the up-scattering process $δ>0$ gets the weaker limits. For the down-scattering process with mass splitting $δ\sim -5$ eV, the DM mass $m_χ$ can be excluded down to as low as 0.1 MeV.

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Yuchao Gu, Lei Wu, Bin Zhu. 2022-10-06. Detection of Inelastic Dark Matter via Electron Recoils in SENSEI. https://doi.org/10.1103/physrevd.106.075004

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