Dark Matter Search Results from 1.54 Tonne·Year Exposure of PandaX-4T
Zihao Bo1, Wei Chen1, Xun Chen2,1,3,4
1Shanghai Jiao Tong University, School of Physics and Astronomy, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Abstract:
In this Letter, we report the dark matter search results from the commissioning run (Run0) and the first science run (Run1) of the PandaX-4T experiment. The two datasets were processed with a unified procedure, with the Run1 data treated blindly. The data processing is improved compared to previous work, unifying the low-level signal reconstruction in a wide energy range up to 120 keV. With a total exposure of 1.54 tonne·year, no significant excess of nuclear recoil events is found. The lowest 90% confidence level exclusion on the spin-independent cross section is 1.6×10^{-47} cm^{2} at a dark matter mass of 40 GeV/c^{2}. Our results represent the most stringent constraint for a dark matter mass above 100 GeV/c^{2}.
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