PandaX is an experimental program which employs a series of xenon detectors to search for elusive dark matter particles and to study the fundamental properties of neutrinos. PandaX was founded in 2009 by Prof. Xiangdong Ji, who also served as the first spokesperson of the collaboration until 2018. Up to now, the collaboration has constructed and operated three generation of experiments, PandaX-I, PandaX-II, and PandaX-4T, with active target masses of 120 kg, 580 kg, and 3.7 tonne, respectively. The collaboration is also preparing for the next generation multi-ten-tonne experiment, PandaX-xT, aimed to be an ultimate dark matter direct detection experiment and a leading project to test the Majorana nature of the neutrinos.
PandaX-II is a dark matter direct detection experiment equipped with a half-ton scale dual-phase time projection chamber (TPC), operated in CJPL between Oct. 2014 and June 2019. In 2016 and 2017, PandaX-II produced the world leading constraints to dark matter-nucleon interactions.
With 6-ton of total Xenon and 4-ton sensitive target, PandaX-4T aims to improve the dark matter sensitivity by one order of magnitude in comparison to PandaX-II. PandaX-4T also plans to make sensitive searches on neutrinoless double beta decay of , and other signals from new physics. This project has been commissioned in 2021 and started data taking since then.
PandaX-III is a R&D effort to develop a high pressure gaseous Xenon TPC as a potential technology to search for the neutrinoless double beta decay of .
On December 24, 2021, the first dark matter search result from PandaX-4T, a liquid xenon detection experiment, was published in Physical Review Letters as the "Editor's Suggestion" [1]. The American Physical Society 《Physics》 reported this PandaX-4T latest result together with another result from the Axion Dark Matter Experiment with a title of "Tightening the Net on Two Kinds of Dark Matter"
A new result on searching of light dark matter (DM) with PandaX-II experimental data was published online in Physical Review Letters on May 28, 2021 with a title of "Search for Light Dark Matter–Electron Scattering in the PandaX-II Experiment "[1]. This is the 6th PRL paper published with PandaX-II data.
The PandaX-II experiment is completed and the PandaX-4T experiment is under installation. The future PandaX program will focus on the following two main directions:
New results on the detection of axions and galaxy axion-like particles(ALPs) with 80 day of PandaX-II data were published online in Physical Review Letters on Nov 1, 2017 (on the same issue with another PandaX-II paper on 54 ton-day WIMP search results).
