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Author(s)
| Du, Meng-Lin (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Baru, Vadim (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP ; Moscow, ITEP ; Lebedev Inst.) ; Guo, Feng-Kun (Beijing, KITPC ; Beijing, GUCAS) ; Hanhart, Christoph (IAS, Julich ; JCHP, Julich) ; Meißner, Ulf-G. (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP ; IAS, Julich ; JCHP, Julich ; Tbilisi State U.) ; Oller, José A. (Murcia U.) ; Wang, Qian (South China Normal U. ; Beijing, Inst. High Energy Phys.) |
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Abstract
| The updated analysis of LHCb of the $\Delta_b^0 \to J/\psi pK^-$ process with an order of magnitude larger data sample led to three narrow pentaquark states, i.e. $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. We analyze the measured J/ψp invariant mass distribution by solving the Lippmann-Schwinger equation with both the dynamical $\sum^{(*)}\bar{D}^{(*)}$ and $J/\bar p$ channels under the assumption that the crossed-channel effects provide a smooth incoherent background. We find that the data can be well described in the hadronic molecular picture, which predicts seven $\sum^{(*)}\bar{D}^{(*)}$ molecular states. In particular, we show that there is evidence in the data for an additional narrow $\sum_c^* \bar{D}$ bound state, which is different from the broad one reported by LHCb in 2015. |