Study of pentaquarks on the lattice with overlap fermions -: art. no. 074508

被引：85
|
作者：
Mathur, N [1 ]
Lee, FX
Alexandru, A
Bennhold, C
Chen, Y
Dong, SJ
Draper, T
Horváth, I
Liu, KF
Tamhankar, S
Zhang, JB
机构：
[1] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
[2] George Washington Univ, Dept Phys, Ctr Nucl Studies, Washington, DC 20052 USA
[3] Jefferson Lab, Newport News, VA 23606 USA
[4] Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China
[5] Univ Adelaide, CSSM, Adelaide, SA 5005, Australia
[6] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia
来源：
PHYSICAL REVIEW D | 2004年 / 70卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.70.074508
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a quenched lattice QCD calculation of spin-1/2 five-quark states with uudd (s) over bar quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either I=0 or I=1. The states we found are consistent with KN scattering states which are checked to exhibit the expected volume dependence of the spectral weight. The results are based on overlap-fermion propagators on two lattices, 12(3)x28 and 16(3)x28, with the same lattice spacing of 0.2 fm, and pion mass as low as similar to180 MeV.
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页数：11
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