スライド 1 - j-parc分室.ppt

* * All the 15 Jacobi channels * Level I=1 * Real scaling T=1 * In order to see in more detail whether each discrete states survive as a resonance or melt into the non- resonance NK continuum state, we finally solve the scattering problem using Kohn-type coupled-channel variational method. This method is useful for the scattering between composed particle and were used in the 3q-3q scattering in the study of NN interaction. (For example, M. Oka and K. Yazaki, Prog. Thor. Phys. 66, 556 (1981).) Phase shift of J=1/2 – and 1/2 + Scattering phase shifts No resonance in 0 – 500 MeV above the N-K threshold N+K threshold I did the same calculation using a linear type confining potential, recently. The result that we had no resonance in the reported energy region of Θ+ was qualitatively was the same as the present one. I also calculated the other spin parity states such as 3/2+ and 3/2- . But, we had no resonance states in the observed energy region. (1) Pentaquark system u u d d s (2) Tetra quark u u C C Non-relativistic 4- and 5-body constituent quark Θ+ X(3872) D0 + D ρ+J/Ψ（T=1) X(3871.2) ω+ηC (T=1) η+J/Ψ (T=0) 3644MeV 3756 3763 3872.4 3871.2 ρ+ηC(T=1) X(3872):3871.2±0.5 MeV 1++ Γ2.3MeV Phys. Rev. Lett. 91, 262001 (2003) Belle Group u u C C Theoretical interesting issue: Can we explain the observed mass and width of X(3872) as a tetra quark state? Or X(3872) is qq meson state? (2) Is there any manifestly exotic tetra quark meson? For example, X+(ccud),X-(ccdu) are the manifestly exotic hadrons which cannot be constructed by qq. Tetra quark u u C C At first, let’s search for manifestly Exotic tetra-quark hadron ( I=1 state) around the energy region of DD* threshold. If X(3872) is I=1 X+(ccud) X0(ccqq) X-(ccdu) It is possible to find X± states which are manifestly exotic mesons. I=1 state J/Ψ+π 3255 MeV 3756 3871 3872 X(3871.2) ηC+ρ J/Ψ+ρ DD* u u C C u u C C π、ρ J/Ψ、ηC D D The qq interaction employed in the pentaquark does not