Four- and five-body calculation of resonance and scattering states of exotic hadoron systems

Scattering problem of uudd$\bar{s}$ system, in the standard non- relativistic quark model, is for the first time, by treating the large five-body modelspace including the NK scattering channel accurately with the Gaussian expansion method and Kohn- type coupled-channel variational method. The NK scattering phase shift calculated shows no resonance corresponding to the reported pentaquark $\Theta^+(1540)$ MeV. The phase shift does show two resonance at energies much higher than the $\Theta^+$ (1540) MeV energy region; one is a broad $1/2^+$ resonance with width of $\Gamma \approx 110$ MeV located at $\approx$ 535 MeV above the NK threshold, and the other is a sharp $1/2^-$ resonance with $\Gamma =0.24$ MeV at 539 MeV. We also will report the structure of X(3872)which has been reproted by the Belle gourp.