Lattice study of the exotic S=+1 baryon -: art. no. 152001

被引：89
|
作者：
Sasaki, S [1 ]
机构：
[1] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 15期
基金：
日本学术振兴会;
关键词：
D O I：
10.1103/PhysRevLett.93.152001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We propose S=+1 baryon interpolating operators, which are based on an exotic description of the antidecuplet baryon, like the diquark-diquark-antiquark structure. By using one of the new operators, the mass spectrum of the spin-1/2 pentaquark states is calculated in quenched lattice QCD at beta=6/g(2)=6.2 on a 32(3)x48 lattice. It is found that the J(P) assignment of the lowest Theta(uudd (s) over bar) state is most likely (1/2)(-). We also calculate the mass of the charm analog of the Theta and find that the Theta(c)(uudd (c) over bar) state lies much higher than the DN threshold, in contrast to several model predictions.
引用
收藏
页码：152001 / 1
页数：4
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