Chiral dynamics and s-wave exotic hadrons
  Based on chiral dynamics, existence of exotic hadrons is discussed in the SU(3) symmetric limit. The low energy s-wave interaction of the Nambu-Goldstone boson with a hadron is known to be determined model-independently, which has been used to generate some hadron resonances in nonexotic channels. We show that this interaction in any exotic channels is not strong enough to generate a bound state. 
Tetsuo Hyodo (1), Daisuke Jido (1), Atsushi Hosaka (2) ((1) YITP,   Kyoto Univ., (2) RCNP, Osaka Univ.)