Molecular Structures in Hidden Charm Meson and Charmed Baryon Spectrum

Abstract

Using a constituent quark model we study the mass and decay channels of meson meson and meson baryon structures in the charm sector. We show that the $X(3872)$ and $X(3940)$ resonances can be described as mixed charmonium-molecular states with $J^{PC}=1^{++}$, whereas the $X(3915)$ and the $Y(3940)$ can be assigned to similar mixed states with $J^{PC}=0^{++}$. In the baryon spectrum we identify the ${\Lambda }_c^{+}(2940)$ as a $D^{\ast }N$ molecule with $(I)J^P=(0)3/2^{-}$ and the recently reported $X_c(3250)$ as a $D^{\ast }\Delta$ resonance with $(I)J^P=(1)5/2^{-}$ or $(I)J^P=(2)3/2^{-}$.

Comments: to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013)