Quark model study of multiquark states

中国物理C, 2009, 33(12): 1285-1290.

^1, , ^2, , ^3, , ^4,

1.Physics Department,Nanjing Normal University,Nanjing 210097,China

2.School of Mathematics and Physics,Chongqing Jiaotong University,Chongqing 400074,China

3.Physics Department,Nanjing Normal University,Nanjing 210097,China

4.Joint Center for Particle Nuclear Physics and Cosmology,Nanjing University and Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210093,China

基金项目: 高等学校博士学科点专项科研基金(20070319007) 国家自然科学基金(10775072)

Quark model study of multiquark states

PING Jia-Lun ^1, , DENG Cheng-Rong ^2, , HUANG Hong-Xia ^3, , WANG Fan ^4,

1.Physics Department,Nanjing Normal University,Nanjing 210097,China

2.School of Mathematics and Physics,Chongqing Jiaotong University,Chongqing 400074,China

3.Physics Department,Nanjing Normal University,Nanjing 210097,China

4.Joint Center for Particle Nuclear Physics and Cosmology,Nanjing University and Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210093,China

Keywords： quark model

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.

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Quark model study of multiquark states

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