$Λ^+_c \to π^0 ϕp$衰变的三角奇异性和可能的$ϕp$共振
Triangular singularity and a possible $ϕp$ resonance in the $Λ^+_c \to π^0 ϕp$ decay
摘要：
我们研究了$Λ^+_c \to π^0 ϕp$的衰变通过考虑一个三角形奇异机制。在该机制中，$Λ^+_c$衰变为$K^* Σ^*(1385)$，$Σ^*(1385)$衰变为$π^0 Σ$（或$Λ$），然后$K^* Σ$（或$Λ$）相互作用产生最终状态的$ϕp$。这种机制产生了一个峰值结构周围的$2020$ MeV。此外，通过考虑$K^* Λ$、$K^* Σ$和$ϕp$的末态相互作用，还考虑了存在一个隐奇类五夸克态的可能性.我们的结论是，这是很难搜索隐藏的奇怪的类似物的$P_c$状态在这个衰变。然而，我们确实期望PDMATHAMT不变质量分布中的非平凡行为。这些预测可以通过BESIII、LHCb和Belle-II等实验进行验证。
英文摘要：
We study the $Λ^+_c \to π^0 ϕp$ decay by considering a triangle singularity mechanism. In this mechanism, the $Λ^+_c$ decays into the $K^* Σ^*(1385)$, the $Σ^*(1385)$ decays into the $π^0 Σ$ (or $Λ$), and then the $K^* Σ$ (or $Λ$) interact to produce the $ϕp$ in the final state. This mechanism produces a peak structure around $2020$ MeV. In addition, the possibility that there is a hidden-strange pentaquark-like state is also considered by taking into account the final state interactions of $K^* Λ$, $K^* Σ$, and $ϕp$. We conclude that it is difficult to search for the hidden-strange analogue of the $P_c$ states in this decay. However, we do expect nontrivial behavior in the $ϕp$ invariant mass distribution. The predictions can be tested by experiments such as BESIII, LHCb and Belle-II.
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