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

We study heavy baryons with exotic flavor quantum numbers formed by a heavy meson and a nucleon ((D) over barN and BN) with positive parity. One-pion-exchange interaction, providing a tensor force, dominates as a long-range force to bind the (D) over barN 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 (D) over barN and BN resonant states in the J(P) = 1/2(+), 3/2(+), and 5/2(+) channels with I = 0.