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Detection of Inelastic Dark Matter via Electron Recoils in SENSEI
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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 $\delta \equiv m_{\chi_2}-m_{\chi_1}<0$ is more strongly constrained while the up-scattering process $\delta>0$ gets the weaker limits. For the down-scattering process with mass splitting $\delta \sim -5$ eV, the DM mass $m_{\chi}$ can be excluded down to as low as 0.1 MeV.
Forward citations
Cited by 3 Pith papers
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Probing Supernova Neutrino Boosted Dark Matter with Collective Excitation
Galactic supernova neutrino boosted dark matter can produce plasmon excitations in silicon detectors, improving sub-MeV dark matter sensitivity by 3 to 4 orders of magnitude over Super-K.
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Direct Detection of Leptophobic Dark Matter with Electronic Collective Excitations
Leptophobic dark matter can excite plasmons in silicon through hadronic loops, and SENSEI data now constrain its nucleon cross section down to ~1e-31 cm^2 in the sub-MeV mass range.
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Halo-dependent Anharmonic Effects in Collective Excitation for Light Dark Matter Direct Detection
Expected sensitivity of phonon-based light dark matter detectors varies by a factor of 2-3 depending on which Gaia-inspired dark matter substructure is assumed, because anharmonic crystal effects depend on the dark ma...
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