$\Theta^+$ pentaquark in the nuclear medium
  We study the interaction of the $\Theta^+$ pentaquark with nuclear matter associated to the $KN$ decay channels and to the two meson cloud. We find that the potential is attractive and could be strong enough to lead to the existence of $\Theta^+$ nuclear bound states. 
M. J. Vicente Vacas, D. Cabrera, Q. B. Li, V. K. Magas and E. Oset