Nucleon, Δ, and Ω excited state spectra in Nf=2+1 lattice QCD

被引：97
作者：
Bulava, J. [1 ]
Edwards, R. G. [2 ]
Engelson, E. [3 ]
Joo, B. [2 ]
Lin, H-W. [4 ]
Morningstar, C. [5 ]
Richards, D. G. [2 ]
Wallace, S. J. [3 ]
机构：
[1] DESY, NIC, D-15738 Zeuthen, Germany
[2] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[3] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[4] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[5] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
来源：
PHYSICAL REVIEW D | 2010年 / 82卷 / 01期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevD.82.014507
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The energies of the excited states of the nucleon, Delta, and Omega are computed in lattice QCD, using two light quarks and one strange quark on anisotropic lattices. The calculation is performed at three values of the light quark mass, corresponding to pion masses m m(pi) = 392(4), 438(3), and 521(3) MeV. We employ the variational method with a large basis of interpolating operators enabling six energies in each irreducible representation of the lattice to be distinguished clearly. We compare our calculation with the low-lying experimental spectrum, with which we find reasonable agreement in the pattern of states. The need to include operators that couple to the expected multihadron states in the spectrum is clearly identified.
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页数：14
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