Dark Matter Search Results from the PandaX-4T Commissioning Run
Yue Meng1,2, Zhou Wang1,2,3, Yi Tao1,2
1School of Physics and Astronomy, Shanghai Jiao Tong University, MOE Key Laboratory for Particle Astrophysics and Cosmology, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Physical Review Letters
|January 14, 2022
Summary
The PandaX-4T experiment found no significant dark matter signal in its initial run. This dark matter search sets new limits on spin-independent interactions between dark matter and nucleons.
Area of Science:
- Experimental particle physics
- Astroparticle physics
- Cosmology
Background:
- The nature of dark matter remains one of the most significant unsolved problems in physics.
- Direct detection experiments aim to observe dark matter particles interacting with ordinary matter.
Purpose of the Study:
- To present the first dark matter search results from the PandaX-4T experiment.
- To establish stringent limits on dark matter-nucleon interactions.
Main Methods:
- Utilized a time projection chamber with 3.7 tonne of liquid xenon.
- Analyzed commissioning data with an exposure of 0.63 tonne·year.
- Searched for nuclear recoil events in the energy range of 5-100 keV.
Main Results:
- Identified 1058 candidate events, with no significant excess over expected background.
- Set a lower limit on the spin-independent dark matter-nucleon cross section at 3.8×10⁻⁴⁷ cm² (90% C.L.) for a dark matter mass of 40 GeV/c².
Conclusions:
- The PandaX-4T experiment's initial data is consistent with background expectations.
- The results provide competitive constraints on dark matter properties, particularly for spin-independent interactions.
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