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Cao, Zhen; Bai, Y X; Bi, Y J; Chen, Liang; Chen, M J; Chen, M L; Chen, Q H; Chen, S Z; Chen, Y; Dai, B Z; Dai, Z G; Fang, J; Gao, C D; Gao, L Q; Gao, W K; Gong, G H; Guo, F L; Guo, X L; Guo, Y Q; Guo, Y Y; He, H H; He, H N; Hor, Y K; Hou, C; Hu, H B; Hu, S C; Huang, W H; Huang, Y; Huang, Z C; Li, B B; Li, Cong; Li, F; Li, H B; Li, H C; Li, J; Li, Jian; Li, Xin; Li, Y Z; Li, Zhe; Li, Zhuo; Lin, S J; Liu, D; Liu, H D; Liu, J; Liu, J L; Liu, R Y; Liu, Y; Luo, Q; Lv, H K; Ma, L L; Ma, X H; Mao, J R; Masood, A; Pang, B Y; Qi, Y Q; Ruffolo, D; Song, H C; Sun, Z B; Tam, P H T; Tang, Z B; Wang, H; Wang, H G; Wang, J S; Wang, L P; Wang, L Y; Wang, X Y; Wang, Y P; Wang, Zhen; Wei, J J; Wei, Y J; Wu, C Y; Wu, S; Xia, J J; Xiang, G M; Xing, Y; Xiong, Z; Xu, D L; Xu, R X; Yang, F F; Yang, L L; Yao, Z G; You, Z Y; Zeng, T X; Zeng, Z K; Zha, M; Zhang, J L; Zhang, P P; Zhang, R; Zhang, S R; Zhang, X; Zhang, X P; Zhang, Yong; Zhao, B; Zhao, J; Zhao, S P; Zheng, Y; Zhou, H; Zhou, R; Zhu, K J; Ng, K C Y
Physical review letters, 12/2022, Letnik: 129, Številka: 26Journal Article
The kilometer square array (KM2A) of the large high altitude air shower observatory (LHAASO) aims at surveying the northern γ-ray sky at energies above 10 TeV with unprecedented sensitivity. γ-ray observations have long been one of the most powerful tools for dark matter searches, as, e.g., high-energy γ rays could be produced by the decays of heavy dark matter particles. In this Letter, we present the first dark matter analysis with LHAASO-KM2A, using the first 340 days of data from 1/2-KM2A and 230 days of data from 3/4-KM2A. Several regions of interest are used to search for a signal and account for the residual cosmic-ray background after γ/hadron separation. We find no excess of dark matter signals, and thus place some of the strongest γ-ray constraints on the lifetime of heavy dark matter particles with mass between 10^{5} and 10^{9} GeV. Our results with LHAASO are robust, and have important implications for dark matter interpretations of the diffuse astrophysical high-energy neutrino emission.
