Search for Light Dark Matter with 259-day data in PandaX-4T
Minzhen Zhang, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Xiangyi Cui, Manna Deng, Yingjie Fan, Deqing Fang, Xuanye Fu, Zhixing Gao, Yujie Ge, Lisheng Geng, Karl Giboni, Xunan Guo, Xuyuan Guo, Zichao Guo, Chencheng Han, Ke Han, Changda He, Jinrong He, Houqi Huang

TL;DR
This paper reports on a search for light dark matter particles using PandaX-4T data, setting new constraints on interaction cross-sections and improving previous limits across various mass ranges and interaction types.
Contribution
The study provides the most stringent constraints to date on certain dark matter interactions in the specified mass ranges, utilizing new data from PandaX-4T with improved analysis techniques.
Findings
Established new upper limits on spin-independent dark matter-nucleon interactions.
Improved dark matter-electron scattering cross-section limits by factors of 1.5 and 9.3.
Set the most stringent constraints on specific dark matter interaction cross-sections in the 2.0-5.3 GeV/$c^2$ mass range.
Abstract
We present a search for light dark matter particles through their interactions with atomic electrons and nucleons, utilizing PandaX-4T data with an effective exposure of 1.04 tonneyear for ionization-only data and 1.20 tonneyear for paired data. Our analysis focuses on the energy range (efficiency0.01) of approximately 0.33 to 3 keV for nuclear recoils, and from 0.04 to 0.39 keV for electronic recoils. We establish the most stringent constraints on spin-independent dark matter-nucleon interactions within a mass range of 2.5 to 5.0 GeV/, spin-dependent neutron-only interactions within 2.0 to 5.3 GeV/, and spin-dependent proton-only interactions within 2.0 to 3.8 GeV/. Their corresponding limits at 3\,GeV/ are , , and \,cm, respectively. Additionally, our results improve the upper…
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