Quark model study of multiquark states
The six- and four-quark systems are studied in the framework of constituent quark models. It is emphasized that the color confinement used in multiquark system should be different from the one used in two- or three-quark system. For six-quark system, we look for △△ and N△ dibaryon resonances by calculating NN scattering phase shifts with explicit coupling to these dibaryon channels in quark delocalization and color screening model. The model gives a good description of low-energy NN properties and predicts IJ~P=03~+ and 01~+ △△ resonances, which can be promising candidates for the isoscalar ABC structure reported by the CELSIUS-WASA Collaboration. For tetraquark system, a flux-tube quark model with multi-body confinement interaction is employed to study Y(2175) as a tetraquark state. The Y(2175) with diquark-antidiquark structure has energy 2174 MeV which is very consistent with experimental data. The calculation shows that multi-body confinement potential may play a vital role in the multiquark system.
quark model dibaryon tetraquark color confinement multibody interaction
PING Jia-Lun DENG Cheng-Rong HUANG Hong-Xia WANG Fan
Physics Department,Nanjing Normal University,Nanjing 210097,China School of Mathematics and Physics,Chongqing Jiaotong University,Chongqing 400074,China Joint Center for Particle Nuclear Physics and Cosmology,Nanjing University and Purple Mountain Obser
国际会议
The 12th International Workshop on the Physics of Ezcited Nucleon NSTAR2009(2009激发态核子物理研讨会)
北京
英文
1285-1290
2009-04-19（万方平台首次上网日期，不代表论文的发表时间）