P_c(4457) Interpreted as a J^P = 1/2⁺ State by ${\overline{D}}^0{\Lambda }_c^{+}(2595)$ – π⁰P_c(4312)

Abstract P_c(4457) has been discovered over five years, but the parity of this particle remains undetermined. We propose a new interpretation for P_c(4457), which is the state generated from the coupled-channel ${\overline{D}}^0{\Lambda }_c^{+}(2595)$ and π⁰P_c(4312) since they can exchange an almost on-shell ${\Sigma }_c^{+}$. In this scenario, the parity of P_c(4457) will be positive, which is different from the candidate of the bound state of ${\overline{D}}^{*}{\Sigma }_c$. The main decay channel of P_c(4457) in this model is P_c(4312)π. We propose three processes ${\Lambda }_b^0\to J/\psi K_{s}p{\pi }^{-}$, ${\Lambda }_b^0\to J/\psi K^{-}p{\pi }^0$, and ${\Lambda }_b^0\to J/\psi p{\pi }^{-}{\pi }^{+}{K}^{-}$ to verify P_c(4457) → P_c(4312)π.