In this work, we propose that there exists a moving triangle singularity in the ψ(2S)→π+π−K+K− process, whose position can vary from 1.158 to 1.181 GeV in the invariant mass spectrum of K+K−. After a precise analysis on this process, it turns out that after doing some cuts on mπ+π−, experiments do have the opportunity to observe this triangle singularity. In addition, when changing the cuts on mπ+π−, the movement of the predicted triangle singularity can also be observed. Thus, we suggest future experiments, especially Super Tau-Charm Facility (STCF), to do an anlysis on the ψ(2S)→π+π−K+K− process to verify our prediction.
Cite
@article{arxiv.2109.08349,
title = {Proposal to detect a moving triangle singularity in $\psi(2S) \to \pi^+ \pi^- K^+ K^-$ process},
author = {Qi Huang and Jia-Jun Wu},
journal= {arXiv preprint arXiv:2109.08349},
year = {2021}
}