Optimal gamma-ray selections for monochromatic line searches with DAMPE

Optimal gamma-ray selections for monochromatic line searches with DAMPE
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使用 DAMPE 进行单色线搜索的最佳伽马射线选择

DOI：
10.1007/s11467-021-1121-6
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发表时间：
2021-07
期刊：
Front. Phys.
影响因子：
--
通讯作者：
Chang Jin
Chang Jin
中科院分区：
其他
文献类型：
--
作者：
Xu Zun-Lei;Duan Kai-Kai;Jiang Wei;Lei Shi-Jun;Li Xiang;Shen Zhao-Qiang;Ma Tao;Su Meng;Yue Chuan;Fan Yi-Zhong;Chang Jin

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暗物质粒子探测器（DArk Matter Particle Explorer， DAMPE）是一种空间高能宇宙射线探测器，覆盖了宽的能带，具有高能量分辨率。DAMPE的关键科学目标之一是通过寻找高能伽玛射线线结构对暗物质进行间接探测。为了提高DAMPE伽玛射线线搜索的灵敏度，提高伽玛射线光子的接受度和能量分辨率至关重要。在本文中，我们定量地证明了光子样品的最大接受比能量分辨率是最优的线搜索。因此，我们开发了一个专门针对行搜索优化的行搜索样本。同时，为了增加统计量，我们还选择了所谓的BGO-only光子，它们只在BGO量热计中转换成+e -对。然后对标准、线搜索和仅bgo光子样品进行单独和集体的线搜索测试。结果表明，数据集的适当组合可以显著提高极限值，与仅使用标准样本相比，最高的情况下可提高约20%。
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 intoe+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.
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