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In this article, we illustrate how to calculate the hadronic couplingconstants of the pentaquark states with the QCD sum rules based on rigorousquark-hadron quality, then study the hadronic coupling constants of the lowestdiquark-diquark-antiquark type hidden-charm pentaquark state with thespin-parity $J^P={\frac{1}{2}}^-$ in details, and calculate the partial decaywidths. The total width $\Gamma(P_c)=14.32\pm3.31\,\rm{MeV}$ is compatible withthe experimental value $\Gamma_{P_c(4312)} = 9.8\pm2.7^{+ 3.7}_{- 4.5} \mbox{MeV}$ from the LHCb collaboration, and favors assigning the $P_c(4312)$ to bethe $[ud][uc]\bar{c}$ pentaquark state with the $J^P={\frac{1}{2}}^-$. Thehadronic coupling constants have the relation $|G_{PD^-\Sigma_c^{++}}|=\sqrt{2}|G_{P\bar{D}^0\Sigma_c^+}|\gg |G_{P\bar{D}^0\Lambda_c^+}|$, and favorthe hadronic dressing mechanism. The $P_c(4312)$ maybe have adiquark-diquark-antiquark type pentaquark core with the typical size of the$qqq$-type baryon states, the strong couplings to the meson-baryon pairs$\bar{D}\Sigma_c$ lead to some pentaquark molecule components, and the$P_c(4312)$ maybe spend a rather large time as the $\bar{D}\Sigma_c$ molecularstate.

The hadronic coupling constants of the lowest hidden-charm pentaquark state with the QCD sum rules in rigorous quark-hadron duality