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PandaX collaboration published a new result of light dark matter searching in Physics Review Letters

Jun 4, 2021

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.

Latest progress report and future plan

Jan 17, 2021
The PandaX (particle and astrophysical xenon) observatory uses xenon as target and detector to search for WIMP particles as well as neutrinoless double beta decay ($0\nu\beta\beta$) in ${}^{136}Xe$. At present, 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: Develop PandaX-4T into a multi-purpose liquid xenon experiment, to push further the dark matter search and other physics topics; Develop and operate a 100-kg high pressure gas TPC (HpgTPC), PandaX-III, as a pathfinder for a tracking calorimeter to search for $0\nu\beta\beta$ in ${}^{136}Xe$. The full International Advisory Committee 2020 Report.

New WIMP and axion search results from complete exposure of PandaX-II released

Aug 26, 2020

The PandaX collaboration released the latest results on the search of WIMPs and axions based on the full exposure of data at the International High Energy Physics Conference (ichep2020) on July 30, 2020 (PDF). Detailed analyses were reported with an online seminar on August 20(PDF1, PDF2 ). The most stringent constraint is set for WIMPs around $10 GeV/c^{2}$ using the nuclear recoil events. The intriguing electron recoil event excess observed by XENON1T [1] was tested with the electron recoil data, and was found to be within the constraint of the PandaX-II data.

PandaX-II published new results on the search of axions

Nov 9, 2017
New results on the detection of axions and galaxy axion-like particles (ALPs) with 80 days of PandaX-II data were published online in Physical Review Letters on Nov 1, 2017 (in the same issue as another PandaX-II paper on 54 ton-day WIMP search results). No positive signal was found by the most sensitive detector in the world, so the most stringent constraints on the properties of axions and ALPs were set. Axion is a new type of particle proposed by Steven Weinberg and Frank Wilczek in the late 1970s to explain CP conservation in strong interactions. It is also one of the top candidates for dark matter.

PandaX-II 54 Ton-day Results Published and Highlighted

Oct 31, 2017
Recent result from PandaX-II was published on Physical Review Letter (Phys. Rev. Lett. 119, 181302, “Editor’s Suggestion”) on October 30, 2017, back-to-back with the first result from XENON1T experiment. The papers are highlighted by a Physics “Viewpoint” commentary by Dan Hooper from FNAL and Univ. of Chicago, commenting that “… the latest results from two dark matter searches have further ruled out many theoretically attractive dark matter particle candidates …”, and “… representing the cutting edge in the search for dark matter …”.

PandaX-II released the official 54-ton-day WIMP search results

Sep 1, 2017
The PandaX-II collaboration released the official WIMP search results using 54 ton-day exposure on Aug. 23, 2017. No excess events were found above the expected background. The most stringent upper limit on spin-independent WIMP-nucleon cross section was set for a WIMP mass greater than $100 GeV/c^{2}$, with the lowest exclusion at $8.6\times10^{-47} cm^{2}$ at $40 GeV/c^{2}$. The result reported here is more conservative than the preliminary result shown during the TeVPA2017 conference, due to the adoption of updated photon/electron detection efficiencies. A paper was submitted to Physical Review Letter with its preprint at http://arxiv.org/abs/arXiv:1708.06917.

New world-leading upper limit for spin independent WIMP-nucleon cross section from PandaX

Aug 8, 2017
Prof. Xiangdong Ji of Shanghai Jiao Tong University and University of Maryland, spokesperson of the PandaX Collaboration, announced new results on the dark matter (DM) search from the PandaX-II experiment on Monday Aug. 7, during the TeV Particle Astrophysics 2017 Conference at Columbus, Ohio, the United States. No DM candidate was identified within the data from an exposure of 54 ton-day, the largest reported DM direct detection data set to date. A world-leading 90% upper limit for the spin independent DM-nucleon cross section was set to be $6\times10^{-47}cm^{2}$ at the DM mass of $50 GeV/c^{2}$. Download the talk slides.

The future plan of the PandaX experiment

Nov 6, 2016
The PandaX observatory uses xenon as target and detector to search for WIMP particles as well as neutrinoless double beta decay ($0\nu\beta\beta$) in ${}^{136}Xe$. At present, the PandaX-II experiment is in operation in CJPL-I. The future PandaX program will pursue the following three main directions: Continue the operation of PandaX-II until a total of 2-year exposure; Develop and operate a multi-ton multi-purpose liquid xenon experiment, PandaX-xT, to push further the dark matter search; Develop and operate a 200 kg (upgradable to ton-scale) high pressure gas TPC (HpgTPC), PandaX-III, to search for $0\nu\beta\beta$ in ${}^{136}Xe$. Detail Report

The largest running dark-matter experiment has its first result: No finding yet with the world best sensitivity

Jul 22, 2016
Xiangdong Ji, Spokesperson and Project Leader of the PandaX experiment located in the China Jin-Ping underground Laboratory (CJPL), announced the first dark matter search results from the PandaX-II 500 kg liquid xenon detector in the 2016 International Identification of Dark Matter conference at Sheffield, UK in the evening of July 21, 2016 (Beijing Time). He reported that no trace of dark matter was observed with an exposure of 33,000 kg·day of liquid xenon, providing the newest constraints on the existence of dark matter. The sensitivity of the detection has reached the best level in the world. Download Slides PandaX collaboration was founded in 2009 by Prof.