Triangle singularity in the $J/\psi \to \gamma \bar{p}\Delta$ decay

Ke Wang, Rong Li, Bo-Chao Liu

In this work, we study the role of triangle singularity in the $J/\psi \to \gamma \bar{p}\Delta$ decay. We find that through a triangle mechanism, involving a triangle loop composed by $\omega$, $\pi$…