$P_c(4457)$ interpreted as a $J^P=1/2^+$ state by $\bar{D}^0Λ^+_c(2595)$-$π^0 P_c(4312)$ interaction
$P_c(4457)$ has been discovered over five years, but the parity of this particle remains undetermined. In this letter we propose a new interpretation for $P_c(4457)$, which is the state generated from the coupled-channel $\bar{D}^0Λ_c^{+}(2595)$ and $π^0 P_c(4312)$ since they can exchange an almost on-shell $Σ_c^+$. In this scenario, the parity of $P_c(4457)$ will be positive, which is different from the candidate of the bound state of $\bar{D}^*Σ_c$. The main decay channel of $P_c(4457)$ in this model is $P_c(4312)π$. We propose three processes $Λ_b^0 \to J/ψK_s p π^-$, $Λ_b^0 \to J/ψK^- p π^0$, and $Λ_b^0 \to J/ψp π^- π^+ K^-$ to verify $P_c(4457)\to P_c(4312)π$.
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