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The effects of the $\Sigma_c\bar{D}^*$-$\Lambda_{c}(2595)\bar{D}$coupled-channel dynamics and various one-boson-exchange (OBE) forces for theLHCb pentaquark states, $P_c(4440)$ and $P_c(4457)$, are reinvestigated. Boththe pion and $\rho$-meson exchanges are considered for the$\Sigma_c\bar{D}^*$-$\Lambda_{c}(2595)\bar{D}$ coupled-channel dynamics. It isfound that the role of the $\Lambda_{c}(2595)\bar{D}$ channel in thedescriptions of the $P_c(4440)$ and $P_c(4457)$ states is not significant withthe OBE parameters constrained by other experimental sources. The naive OBEmodels with the short-distance $\delta(\vec{r})$ term of the one-pion exchange(OPE) keep failing to reproduce the $P_c(4440)$ and $P_c(4457)$ statessimultaneously. The OPE potential with the full $\delta(\vec{r})$ term resultsin a too large mass splitting for the $J^P=1/2^-$ and $3/2^-$$\Sigma_c\bar{D}^*$ bound states with total isospin $I=1/2$. The OBE model withonly the OPE $\delta(\vec{r})$ term dropped may fit the splitting much betterbut somewhat underestimates the splitting. Since the $\delta(\vec r)$ potentialis from short-distance physics, which also contains contributions from theexchange of mesons heavier than those considered explicitly, we vary thestrength of the $\delta(\vec r)$ potential and find that the masses of the$P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ can be reproduced simultaneously withthe $\delta(\vec r)$ term in the OBE model reduced by about 80\%. While twodifferent spin assignments are possible to produce their masses, in thepreferred description, the spin parities of the $P_c(4440)$ and $P_c(4457)$ are$3/2^-$ and $1/2^-$, respectively.

physical review. d/physical review. d.

Coupled-channel effects of the  $\Sigma_c^{(*)}\bar{D}^{(*)}$-$\Lambda_c(2595)\bar{D}$ system and molecular  nature of the $P_c$ pentaquark states from one-boson exchange model