Dark Matter Search Results from 1.54     Tonne · Year Exposure of PandaX-4T

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…

• NS
  National Science Foundation

  Awards: 12205181, 12090061, 12090060
• T
  Tencent
• NN
  National Natural Science Foundation of China

  Awards: 12205181, 12090061, U23B2070, 12090060, 12325505, 12222505
• CA
  Chinese Academy of Sciences
• SA
  Science and Technology Commission of Shanghai Municipality

  Awards: 23JC1410200, 22JC1410100, ZJ2023-ZD-003, 21TQ1400218
• SJ
  Shanghai Jiao Tong University
• CC
  CAS Center for Excellence in Particle Physics
• OO
  Office of Science
• NK
  National Key Research and Development Program of China

  Awards: 2023YFA1606200, 2023YFA1606201
• FR
  Fundamental Research Funds for the Central Universities