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 forP_c(4457), which is the state generated from the coupled-channel${\overline{D}}^0{\Lambda }_c^{+}(2595)$andπ⁰P_c(4312) since they can exchange an almost on-shell${\Sigma }_c^{+}$. In this scenario, the parity ofP_c(4457) will be positive, which is different from the candidate of the bound state of${\overline{D}}^{*}{\Sigma }_c$. The main decay channel ofP_c(4457) in this model isP_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 verifyP_c(4457) →P_c(4312)π.