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arXiv 1004.5072hep-latnucl-ex
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$N_f=2+1$格点量子色动力学中的核子、$Δ$和$Ω$激发态

Nucleon, $Δ$ and $Ω$ excited states in $N_f=2+1$ lattice QCD

J. Bulava, R. G. Edwards, E. Engelson, B. Joó, H-W. Lin, C. Morningstar, D. G. Richards, S. J. Wallace

备注：
Revised for publication. References added, Table VI expanded to add strange baryon multiparticle thresholds and multiparticle thresholds added to Figs. 4, 5 and 6. 15 pages, 6 figures
发表信息：
Phys.Rev.D82:014507,2010
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摘要：

在格点量子色动力学中，利用各向异性格点上的两个轻夸克和一个奇夸克，计算了核子的激发态、$Δ$和$Ω$的能量。计算在轻夸克质量的三个值下进行，对应于π介子质量$m_π$ = 392（4），438（3）和521（3）MeV。我们采用变分方法与大的基础上的插值算子，使六个能量在每个不可约表示的晶格要清楚地区分。我们比较了我们的计算与低洼的实验光谱，我们发现合理的协议的状态模式。需要包括运营商，耦合到预期的多强子状态的频谱被清楚地确定。

英文摘要：

The energies of the excited states of the Nucleon, $Δ$ and $Ω$ 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 $m_π$ = 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 multi-hadron states in the spectrum is clearly identified.

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