Search for Light Fermionic Dark Matter Absorption on Electrons in PandaX-4T

exposure collected by the PandaX-4T liquid xenon experiment. No significant signals are observed over the expected background. The data are interpreted into limits to the effective couplings between such dark matter and the electron. For axial-vector or vector interactions, our sensitivity is competitive in comparison to existing astrophysical bounds on the decay of such a dark matter candidate into photon final states. In particular, we present the first direct detection limits for a vector (axial-vector) interaction which are the strongest in the mass range from 35 to 55

(25 to 45) keV / c^{2}

in comparison to other astrophysical and cosmological constraints.

fermion: dark matter
interaction: vector
xenon: liquid
photon: final state
dark matter: absorption
coupling: (dark matter 2electron)
electron: recoil
electron: energy spectrum
axial-vector
sensitivity

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