Exotic baryons from a heavy meson and a nucleon
  We evaluate a hadronic molecule formed by a heavy meson and a nucleon respecting heavy quark symmetry. The tensor force of pion exchange potential plays a dominate role to produce an strong attraction in this system. Solving coupled channel Schr\"odinger equations for PN and P* N, we find many bound and resonant states with isospin I=0 while there are few resonances in I=1 state. The rich structures with I=0 indicate that the spectrum of heavy baryons near the threshold is influenced by the contributions from such hadron composite structures. 
Yasuhiro Yamaguchi, Shunsuke Ohkoda, Shigehiro Yasui and Atsushi   Hosaka
hep-ph nucl-th