Resonances in heavy meson - heavy baryon coupled-channel interactions

Abstract

The interactions of ${\bar{D}}^{(\ast )}{\Lambda }_c-{\bar{D}}^{(\ast )}{\Sigma }_c^{(\ast )}$ are studied within the framework of a dynamical coupled-channel approach. A series of bound states and resonances with different spin and parity are dynamically generated in the hidden charm sector. Four $S$-wave bound states are found in the mass range of 4.3 to 4.5 GeV, close to the pentaquark states observed by LHCb. Two of the states have a spin parity of $J^P=1/2^{-}$ and the other two have $J^P=3/2^{-}$. In addition, several resonances with different spin and parity in higher partial waves are predicted.