Diquark Structure of Pentaquark in the Quark Delocalization Colour Screening Model  

作　　者：黄虹霞 龚丽英 平加伦 

机构地区：[1]Department of Physics, Nanjing Normal University, Nanjing 210097 [2]School of Physics and Microelectronics, Shandong University, Jinan 250100

出　　处：《Chinese Physics Letters》2005年第11期2784-2787,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China, and the 333 Project of Jiangsu Province.

摘　　要：In the framework of quark-delocalization, colour-screening model, the diquark structure of pentaquark θ^＋ is studied in detail under the adiabatic approximation. The calculation is carried out by using the fractional parentage expansion technique, which greatly simplify the calculation of the matrix elements of Hamiltonian. The results show that the ground state of the pentaquark has negative parity rather than positive parity, which was proposed by daffe-Wilczek. However the mass obtained is about 1651 MeV which is still higher than the observed mass 1540 MeV.In the framework of quark-delocalization, colour-screening model, the diquark structure of pentaquark θ^＋ is studied in detail under the adiabatic approximation. The calculation is carried out by using the fractional parentage expansion technique, which greatly simplify the calculation of the matrix elements of Hamiltonian. The results show that the ground state of the pentaquark has negative parity rather than positive parity, which was proposed by daffe-Wilczek. However the mass obtained is about 1651 MeV which is still higher than the observed mass 1540 MeV.

关 键 词：INTERMEDIATE RANGE ATTRACTION 

分 类 号：O572.33[理学—粒子物理与原子核物理]