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

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Dec 27, 2024
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Abstract: (arXiv)
We present a novel constraint on light dark matter utilizing 1.541.54 tonne\cdotyear 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/c2c^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 3.51×1039 cm23.51 \times 10^{-39}~\mathrm{cm}^2 at 0.08 MeV0.08~\mathrm{MeV}/c2c^2 for a solar boosted dark matter mass ranging from 0.020.02 to 10 MeV10~ \mathrm{MeV}/c2c^2, achieving a 23 fold improvement compared with earlier experimental studies.
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