Study of $qqq\bar{q}Q$ pentaquark system in the Chiral Quark Model

With the discovery of some hidden-charm pentaquark resonances by the LHCb Collaboration, investigations of pentaquark states containing heavy quarks have aroused the interest of theorists. We study herein $qqq\bar{q}Q$ ($q=u$ or $d$, $Q=c$ or $b$) pentaquark system, in the framework of the chiral quark model. In consequence, some charmed and bottomed pentaquarks are considered to exist by five-body dynamical calculations. In the charm sector, ${\mathrm{\Sigma }}_c\pi (I{J}^P=0{\frac{1}{2}}^{-})$ and ${\mathrm{\Sigma }}_c^{\ast }\pi (I{J}^P=0{\frac{3}{2}}^{-})$ are possible candidates of ${\mathrm{\Lambda }}_c(2595)$ and ${\mathrm{\Lambda }}_c(2625)$, respectively. Besides, two high-spin states, ${\mathrm{\Sigma }}_c^{\ast }\rho (I{J}^P=0{\frac{5}{2}}^{-})$ and $\mathrm{\Delta }{D}^{\ast }(I{J}^P=1{\frac{5}{2}}^{-})$, are also found in the energy region of $3.2 \sim 3.3$GeV\mathrm{.}Inthebottomsector,$\Sigma_b\pi(IJ^P=0\frac{1}{2}^-)$,$\Sigma_b^\pi(IJ^P=0\frac{3}{2}^-)$couldbecandidatesof$\Lambda_b(5912)$and$\Lambda_b(5920)$,respectively\mathrm{.}And$\Sigma_b^\rho(IJ^P=0\frac{5}{2}^-)$and$\Delta B^(IJ^P=1\frac{5}{2}^-)$arefoundintheenergyregionof$6.5 \sim 6.6$GeV\mathrm{.}$\Sigma_c^{()}\pi$and$\Sigma_b^{(*)}\pi$ are expected as compact states, while ${\mathrm{\Sigma }}_c^{\ast }\rho$, ${\mathrm{\Sigma }}_b^{\ast }\rho$, $\mathrm{\Delta }{D}^{\ast }$ and $\mathrm{\Delta }{B}^{\ast }$ are expected as molecular states.