Optimal gamma-ray selections for monochromatic line searches with DAMPE

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...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Zun-Lei Xu, Kai-Kai Duan, Jiang, Wei, Shi-Jun, Lei, Li, Xiang, Zhao-Qiang, Shen, Ma, Tao, Su, Meng, Yuan, Qiang, Yue, Chuan, Yi-Zhong, Fan, Chang, Jin
Format: Article
Language:English
Subjects:
BGO (crystal)
Cosmic rays
Dark matter
Energy
Energy bands
Energy resolution
Gamma rays
Photons
Searching
Space telescopes
Statistical methods
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Summary: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.
ISSN:2331-8422