To Study The Pseudoscalar Meson-Baryon Octet Adn K-(?)^* Interaction In A Chiral Unitaryapproach

In this paper,the unitary method is used to study the pseudoscalar meson-baryon octet interaction and the interaction between K(?)^*.Firstly,we study the pseudoscalar meson-baryon octet interactions using the Bethe-Salpeter equation under the unitary coupled track approximation framework.The loop functions of mesons and baryons in the intermediate states are obtained by means of dimensional regularization in the case of relativistic dynamic effects and off-shell correction.We find that for intermediate state with strangeness S=1 and isospin I=0,before the correction,results show that there are two poles in the 1400MeV range,after the correction,the square of the amplitude is strongly suppressed and only one pole is generated,which is predicted to correspond to the ?(1405)resonance state.Therefore,we consider that the KN interaction produces only one ?(1405)resonance state.Then we study the scattering process of K(?)^*using K matrix method.In the low energy region,the K(?)^*interaction potential mainly comes from the contribution of the T-channel interaction of ?pion,?pion and ?pion.Finally we make a partial wave projection of the scattering amplitude and introduce the shape factor.By the K-matrix method to get the relation between(?)and |T|~2.The results show that only bound states are generated in the intermediate state during the scattering of K(?)^*.