Dark Matter Search Results from the Commissioning Run of PandaX-II
PandaX Collaboration: Andi Tan, Xiang Xiao, Xiangyi Cui, Xun Chen,, Yunhua Chen, Deqing Fang, Changbo Fu, Karl Giboni, Franco Giuliani, Haowei, Gong, Shouyang Hu, Xingtao Huang, Xiangdong Ji, Yonglin Ju, Siao Lei, Shaoli, Li, Xiaomei Li, Xinglong Li, Hao Liang, Qing Lin

TL;DR
This paper reports the results of a WIMP search using the PandaX-II detector, setting new upper limits on the WIMP-nucleon cross section based on the initial commissioning data.
Contribution
First WIMP search results from PandaX-II's commissioning run, establishing new constraints on WIMP interactions with nucleons.
Findings
No WIMP candidates were observed.
Set a 90% upper limit on the WIMP-nucleon cross section.
Achieved a lowest excluded cross section of 2.97×10^{-45} cm^2 at 44.7 GeV/c^2.
Abstract
We present the results of a search for WIMPs from the commissioning run of the PandaX-II experiment located at the China Jinping underground Laboratory. A WIMP search data set with an exposure of 30619.1 kg-day was taken, while its dominant Kr background was used as the electron recoil calibration. No WIMP candidates are identified, and a 90\% upper limit is set on the spin-independent elastic WIMP-nucleon cross section with a lowest excluded cross section of 2.9710~cm at a WIMP mass of 44.7~GeV/c.
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