Two-meson cloud contribution to the baryon antidecuplet self-energy
  We study the self-energy of the SU(3) antidecuplet coming from two-meson virtual clouds. Assuming that the exotic Theta+ belongs to an antidecuplet representation with N(1710) as nucleon partner, we derive effective Lagrangians that describe the decay of N(1710) into N pi pi with two pions in s- or p-wave. It is found that the self-energies for all members of the antidecuplet are attractive, and the larger strangeness particle is more bound. From two-meson cloud, we obtain about 20 % of the empirical mass splitting between states with different strangeness. 
T. Hyodo (1), A. Hosaka (1), F.J. Llanes-Estrada (2), E. Oset (3),   J.R. Pelaez (2), M. J. Vicente Vacas (3) ((1) RCNP, Osa...