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arXiv 1007.4871hep-lat
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格点量子色动力学中核子自旋$\frac{1}{2}$激发的有序化

Ordering of Spin-$\frac{1}{2}$ Excitations of the Nucleon in Lattice QCD

M. S. Mahbub, Waseem Kamleh, Derek B. Leinweber, Alan Ó Cais, Anthony G. Williams

摘要:

本文用变分分析方法给出了核子负宇称低激发态$N{\frac{1}{2}}^{-}$(1535 MeV)${\rm S}_{11}$的结果。分析是在猝灭QCD中进行的,并考虑了FLIC费米子作用。本文主要研究核子的Roper(${\rm{P}}_{11}$)态和负宇称基态(${\rm{S}}_{11}$)之间的能级序。在轻夸克质量下观察到了物理水平有序的证据。各种各样的模糊-模糊关联函数被用来构造相关矩阵。执行全面的相关矩阵分析以确保$N{\frac{1}{2}}^{-}$状态的准确隔离。

英文摘要:

We present results for the negative parity low-lying state of the nucleon, $N{\frac{1}{2}}^{-}$ (1535 MeV) ${\rm S}_{11}$, from a variational analysis method. The analysis is performed in quenched QCD with the FLIC fermion action. The principal focus of this paper is to explore the level ordering between the Roper (${\rm{P}}_{11}$) and the negative parity ground (${\rm{S}}_{11}$) states of the nucleon. Evidence of the physical level ordering is observed at light quark masses. A wide variety of smeared-smeared correlation functions are used to construct correlation matrices. A comprehensive correlation matrix analysis is performed to ensure an accurate isolation of the $N{\frac{1}{2}}^{-}$ state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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