论文标题
通过$ψ（2s）\ to p \ bar {p}η/ p \ bar {p}π^0 $ process检测纯三角sigularity效应
Detecting the pure triangle sigularity effect through the $ψ(2S) \to p \bar{p} η/ p \bar{p} π^0$ process
论文作者
论文摘要
在这项工作中，在$ψ（2s）\ to p \ bar {p}η/ p \ bar {p}π^0 $过程中研究了三角奇异机制。由$ j/ψ$，$η$和$ p $组成的三角环在物理运动范围内具有$ψ（2s）\至p \ bar {p}η/ p \ bar {p} p}π^0 $过程的奇异性，并且它将在$ pssprianiant $ p pers of $ g5 $ p PRECH（$ p）中产生狭窄的高峰（远离阈值和相对共鸣。在这些过程中，所有涉及的顶点都受到实验数据的约束。因此，我们可以在此处进行精确的模型独立预测。事实证明，$Pη$不变的质谱中的峰值是可见的，而在$pπ^0 $不变质量谱中的峰值很小。我们希望将来可以观察到$ p \ bar {p}η$最终状态。
In this work, the triangle singularity mechanism is investigated in the $ψ(2S) \to p \bar{p} η/ p \bar{p} π^0$ process. The triangle loop composed by $J/ψ$, $η$ and $p$ has a singularity in the physical kinematic range for the $ψ(2S) \to p \bar{p} η/ p \bar{p} π^0$ process, and it would generate a very narrow peak in the invariant mass spectrum of $pη(π)$ around $1.56387$ GeV, which is far away from both the threshold and relative resonances. In these processes, all the involved vertices are constrained by the experimental data. Thus, we can make a precise model independent prediction here. It turns out that the peak in the $pη$ invariant mass spectrum is visible, while it is very small in the $pπ^0$ invariant mass spectrum. We expect this effect shown in $p \bar{p} η$ final state can be observed by the Beijing Spectrometer (BESIII) and Super Tau-Charm Facility (STCF) in the future.
