Molecular charmed baryons and pentaquarks from light-meson exchange saturation

The spectrum of the $cqq$ baryons contains a few states whose nature is not clearly a three-quark composite and which might have a sizable baryon-meson component. Examples include the ${\Sigma }_c\left(2800\right)$ or the ${\Lambda }_c\left(2940\right)$. Here we explore the spectrum of two-body systems composed of a light, octet baryon and a charmed meson (or antimeson) within a simple contact-range theory in which the couplings are saturated by light-meson exchanges. This results in the prediction of a series of composite anticharmed pentaquarks ($\overline{c}qqqq$) and singly charmed baryons ($c\overline{q}qqq$). Among the latter we find $J=\frac{1}{2}$ $\Xi D$ and $J=\frac{3}{2}$ $\Xi D^{*}$ bound states with masses matching those of the recently observed ${\Omega }_c\left(3185\right)$ and ${\Omega }_c\left(3327\right)$ baryons.