Exotic baryons from a heavy meson and a nucleon: Positive parity states

Abstract

We study heavy baryons with exotic flavor quantum numbers formed by a heavy meson and a nucleon ($\overline{D}N$ and $BN$) with positive parity. One-pion-exchange interaction, providing a tensor force, dominates as a long-range force to bind the $\overline{D}N$ and $BN$ systems. In the heavy-quark mass limit, pseudoscalar meson and vector meson are degenerate and the binding mechanism by the tensor force analogous to that in the nuclear systems becomes important. As a result, we obtain the $\overline{D}N$ and $BN$ resonant states in the ${J}^{P}=1/{2}^{+}$, $3/{2}^{+}$, and $5/{2}^{+}$ channels with $I=0$.