http://arxiv.org/abs/2210.00004
By applying four different methods including equi-zenith angle method, surrounding window method, direct integration method, and time-swapping method, the number of the background events is calculated. Based on simulation samples, the statistical significance of the excess signal from different background methods is determined. After that, we discuss the limits and the applicability of the four background method under different conditions. Under the detector stability assumption with signal, the results from above four methods are consistent within 1{\sigma} level. On no signal condition, when the acceptance of the detector changes with both space and time, the surrounding window method is most stable and hardly affected. In this acceptance assumption, we find that the background estimation in the direct integration method is sensitive to the selection of time integration window, and the time window of 4 hour is more applicable, which can reduce the impact on the background estimation to some extent.
Y. Wang, M. Zha, S. Hu, et. al.
Tue, 4 Oct 22
14/71
Comments: 19 pages