Dark Matter Search Results from the Commissioning Run of PandaX-II

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 306$\times$19.1 kg-day was taken, while its dominant $^{85}$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 2.97$\times$10$^{-45}$~cm$^2$ at a WIMP mass of 44.7~GeV/c$^2$.