First Measurement of Solar $^8$B Neutrino Flux through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T

• DOI: 10.48550/arxiv.2407.10892
• Publication Date: 2024-07-15
• Authors: PandaX Collaboration; Zihao Bo; Wei Chen; Xun Chen; Yunhua Chen; Zhaokan Cheng; Xiangyi Cui; Yingjie Fan; Deqing Fang; Zhixing Gao; Li-Sheng Geng; Karl Giboni; Xunan Guo; Xuyuan Guo; Zichao Guo; Chencheng Han; K. Han; Changda He; Jinrong He; Di Huang; Houqi Huang; J. Huang; Ruquan Hou; Yu Hou; Xiangdong Ji; X. Ji; Yonglin Ju; Chenxiang Li; Jiafu Li; Mingchuan Li; Shuaijie Li; Tao Li; Zhiyuan Li; Qing Lin; Jianglai Liu; Congcong Lu; Xiaoying Lü; Lingyin Luo; Yunyang Luo; Wenbo Ma; Y. G.; Yajun Mao; Yue Meng; Xuyang Ning; Binyu Pang; Ningchun Qi; Zhicheng Qian; Xiangxiang Ren; Dong Shan; Xiaofeng Shang; Xiyuan Shao; Guofang Shen; Manbin Shen; Wenliang Sun; Yi Tao; Anqing Wang; Guanbo Wang; Hao Wang; Jiamin Wang; Lei Wang; Meng Wang; Qiuhong Wang; Shaobo Wang; Siguang Wang; Wei Wang; Xiuli Wang; Xuming Wang; Zhou Wang; Yuehuan Wei; Weihao Wu; Yuan Wu; Mengjiao Xiao; Xiang Xiao; Kaizhi Xiong; Yifan Xu; Shunyu Yao; Binbin Yan; Xiyu Yan; Yong Yang; Peihua Ye; Chunxu Yu; Ying Yuan; Zhe Yuan; Youhui Yun; Xinning Zeng; Minzhen Zhang; Peng Zhang; Shibo Zhang; Shu Zhang; Tao Zhang; Wei Zhang; Yang Zhang; Yingxin Zhang; Yuanyuan Zhang; Li Zhao; Jifang Zhou; Jiaxu Zhou; Jiayi Zhou; N. Zhou; Xiaopeng Zhou; Yubo Zhou; Zhizhen Zhou
• Keywords: High Energy Physics - Experiment (hep-ex); Astrophysics - Solar and Stellar Astrophysics; FOS: Physical sciences; Nuclear Experiment (nucl-ex); Nuclear Experiment; Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics - Experiment

The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure solar $^8$B neutrino flux by detecting neutrinos through coherent scattering with nuclei. Data samples requiring coincidence of scintillation and ionization signals (paired), as well unpaired ionization-only (US2), are selected energy threshold approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining commissioning run first science PandaX-4T, a total exposure 1.25 1.04 tonne$\cdot$year collected for paired US2, respectively. After unblinding, 3 332 events observed an expectation 2.8$\pm$0.5 251$\pm$32 background events, US2 data, A combined analysis yields best-fit signal 3.5 (75) from (US2) data sample, $\sim$37\% uncertainty, background-only hypothesis disfavored 2.64$\sigma$ significance. This gives ($8.4\pm3.1$)$\times$10$^6$ cm$^{-2}$s$^{-1}$, consistent standard model prediction. indication ``fog'' in dark matter direct detection experiment.