Constraints on Heavy Decaying Dark Matter from 570Days of LHAASO Observations
Constraints on Heavy Decaying Dark Matter from 570Days of LHAASO Observations
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LHAASO 570 天观测对重衰变暗物质的限制
DOI：
10.1103/physrevlett.129.261103
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发表时间：
2022
影响因子：
8.6
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Zhen Cao;F. Aharonian;Q. An;Axikegu;L. X. Bai;Y. X. Bai;Y. W. Bao;D. Bastieri;X. J. Bi;Y. J. Bi;J. T. Cai;Zhe Cao;J. Chang;J. F. Chang;E. S. Chen;Liang Chen;Liang Chen;Long Chen;M. J. Chen;M. L. Chen;Q. H. Chen;S. H. Chen;S. Z. Chen;T. L. Chen;Y. Chen;H.
大型高空空气簇射天文台（LHAASO）的平方公里阵列（KM 2A）旨在以前所未有的灵敏度测量能量超过10 TeV的北射线天空。射线观测长期以来一直是暗物质搜索的最有力工具之一，例如，高能射线可以由重暗物质粒子的衰变产生。在这封信中，我们提出了第一个暗物质分析与LHAASO-KM 2A，使用前340天的数据从-KM 2A和230天的数据从-KM 2A。几个感兴趣的区域被用来搜索一个信号，并占剩余的宇宙射线背景分离后。我们发现没有多余的暗物质信号，因此放置一些最强的射线约束的质量之间的重暗物质粒子的寿命。我们的结果与LHAASO是强大的，并有重要的影响，暗物质的解释弥漫天体物理学的高能中微子发射。
The kilometer square array (KM2A) of the large high altitude air shower observatory (LHAASO) aims at surveying the northern-ray sky at energies above 10 TeV with unprecedented sensitivity.-ray observations have long been one of the most powerful tools for dark matter searches, as, e.g., high-energyrays 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-KM2A and 230 days of data from-KM2A. Several regions of interest are used to search for a signal and account for the residual cosmic-ray background afterseparation. We find no excess of dark matter signals, and thus place some of the strongest-ray constraints on the lifetime of heavy dark matter particles with mass betweenand. Our results with LHAASO are robust, and have important implications for dark matter interpretations of the diffuse astrophysical high-energy neutrino emission.