Optimal gamma-ray selections for monochromatic line searches with DAMPE  

作　　者：Zun-Lei Xu Kai-Kai Duan Wei Jiang Shi-Jun Lei Xiang Li Zhao-Qiang Shen Tao Ma Meng Su Qiang Yuan Chuan Yue Yi-Zhong Fan Jin Chang 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

出　　处：《Frontiers of physics》2022年第3期1-6,共6页物理学前沿（英文版）

基　　金：The DAMPE mission was funded by the strategic priority science and technology projects in space science of Chinese Academy of Sciences;In China the data analysis is supported in part by the National Key Research and Development Program of China(No.2016YFA0400200);the National Natural Science Foundation of China(Nos.U1738210,U1738123,U1738205,U1738138,11921003,and 12003074);the Youth Innovation Promotion Association CAS,the Key Research Program of the Chinese Academy of Sciences Grant(No.ZDRW-KT-2019-5);the Entrepreneurship and Innovation Program of Jiangsu Province.

摘　　要：The DArk Matter Particle Explorer (DAMPE) is a space high-energy cosmic-ray detector covering a wide energy band with a high energy resolution. One of the key scientific goals of DAMPE is to carry out indirect detection of dark matter by searching for high-energy gamma-ray line structure. To promote the sensitivity of gamma-ray line search with DAMPE, it is crucial to improve the acceptance and energy resolution of gamma-ray photons. In this paper, we quantitatively proved that the photon sample with the largest ratio of acceptance to energy resolution is optimal for line search. We therefore developed a line-search sample specifically optimized for the line-search. Meanwhile, in order to increase the statistics, we also selected the so-called BGO-only photons that convert into e^(+)e^(-) pairs only in the BGO calorimeter. The standard, the line-search, and the BGO-only photon samples are then tested for line-search individually and collectively. The results show that a significantly improved limit could be obtained from an appropriate combination of the date sets, and the increase is about 20% for the highest case compared with using the standard sample only.

关 键 词：DArk Matter Particle Explorer(DAMPE) GAMMA-RAY line-search 

分 类 号：O57[理学—粒子物理与原子核物理]