Interactions Between Baryon ? And Heavy Meson D

Understanding the structure and dynamical origin of baryon resonances is one of the most important topics within the field of hadron physics.The study of interactions between low-energy baryons and mesons on quark level in chiral SU?3?quark model and the extended chiral SU?3?quark model have obtained respectable progress.In this thesis,we dynamically investigate the properties of interactions between baryon???and heavy meson?D?,which include the systerms?^*D,?^*D^*,?D and?D^*with fourteen possible quantum numbers,within the framework of the above two models?three sets of parameters?by solving a resonating group method?RGM?equation.Firstly,the study of?^*D and?^*D^*interactions with eight quantum numbers shows that the interactions between?^*and D or D^*in the medium range are attractive,which is from the scalar meson?exchange.We achieved six bound states by solving the bound-state RGM equation.It is found that systerm??^*D?_3/2/2 can form a loosely bound state in chiral SU?3?quark model?model parameter I?when isospin is 1/2,and the corresponding binding energy is about-2.59 MeV.Similarly,the systerm??^*D^*?_5/2is able to form loosely bound states in chiral SU?3?quark model and extended chiral SU?3?quark model with three sets of model parameters when isospin is 1/2,and the corresponding binding energies are-8.85 MeV,-5.11 MeV and-10.62 MeV,respectively.When isospin is 3/2,the systerm??^*D^*?_1/2/2 can form loosely bound states in the extended chiral SU?3?quark model?model parameter II and III?,and the corresponding binding energies are about-2.14 MeV and-1.39 MeV,respectively.Meanwhile,we investigate S-,P-,D-wave scattering phase shifts,and scattering cross sections and contribution of the partial wave scattering cross sections to the total scattering cross section.Our analysis demonstrates that the results of S-wave scattering phase shifts in the medium-low-energy region are qualitatively accord with those of the internal interaction in medium-long-distance region.P-wave scattering phase shifts provide weak attraction,while D-wave scattering phase shifts almost tend to zero.Our current results show that the S-wave scattering cross section makes major contribution to the total scattering cross section,P-wave scattering cross section makes little contribution,and D-wave scattering cross section almost makes no contribution.Secondly,the same theoretical approaches and research processes applied to?D and?D^*systems with six quantum numbers,which include the interaction between?and D or D^*,and the bound states.The results also suggest that the interactions between?and D or D^*in the medium range are attractive,and the interactions dominantly derive from?exchange between light quarks.Compared with?^*D and?^*D^*,the attractive interactions between?and D or D^*are weaker than those in?^*D and?^*D^*systems,therefore we obtain four bound states with the binding energy are relatively small accordingly.By solving the bound-state RGM equation,it is found that systerms??D?_1/2/2 and??D^*?_3/2/2 can form the loosely bound states in chiral SU?3?quark model when isospin is 1/2,and the corresponding binding energies are about-2.48 MeV and-2.03 MeV,respectively.When isospin is 3/2,the system??^*D?_3/2/2 is able to form loosely bound states in model parameter I and III,and the corresponding binding energies are about-6.5 MeV and-1.51 MeV,respectively.Moreover,we also investigate S-,P-,D-wave scattering phase shifts,scattering cross sections and contributions of the partial wave scattering cross sections to the total scattering cross sections.Similarly,the information from their S-wave scattering phase shifts in the medium-low-energy region is qualitative agree with that from the internal interaction in medium-long-distance region.The results in the extended chiral SU?3?quark model show that P-wave scattering phase shifts provide weak attraction,while D-wave scattering phase shifts almost tend to zero.S-wave scattering cross section makes major contribution to the total scattering cross section,P-wave scattering cross section make weak contribution,and D-wave scattering cross section almost has no contribution.However,the results in chiral SU?3?quark model show that P-wave and D-wave scattering phase shifts and the corresponding cross section are not the same as we expected,which need further research.