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arXiv · 2107.13208

Optimal gamma-ray selections for monochromatic line searches with DAMPE

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
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Abstract

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 prove that the photon sample with the largest ratio of acceptance to energy resolution is optimal for line search. We therefore develop 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.

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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. 2021-07-28. Optimal gamma-ray selections for monochromatic line searches with DAMPE. https://arxiv.org/abs/2107.13208

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