Search for Solar Boosted Dark Matter Particles at the PandaX-4T Experiment

Abstract

We present a novel constraint on light dark matter utilizing $1.54$ tonne$\cdot$year of data acquired from the PandaX-4T dual-phase xenon time projection chamber. This constraint is derived through detecting electronic recoil signals resulting from the interaction with solar-enhanced dark matter flux. Low-mass dark matter particles, lighter than a few MeV/$c^2$, can scatter with the thermal electrons in the Sun. Consequently, with higher kinetic energy, the boosted dark matter component becomes detectable via contact scattering with xenon electrons, resulting in a few keV energy deposition that exceeds the threshold of PandaX-4T. We calculate the expected recoil energy in PandaX-4T considering the Sun's acceleration and the detection capabilities of the xenon detector. The first experimental search results using the xenon detector yield the most stringent cross-section of $3.51\times 10^{-39}{\mathrm{cm}}^2$ at $0.08\mathrm{MeV}$/$c^2$ for a solar boosted dark matter mass ranging from $0.02$ to $10\mathrm{MeV}$/$c^2$, achieving a 23 fold improvement compared with earlier experimental studies.

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