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arXiv 1005.1748hep-lathep-phnucl-th
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含两个轻动力学夸克的QCD的介子和重子谱

Meson and baryon spectrum for QCD with two light dynamical quarks

Georg P. Engel, C. B. Lang, Markus Limmer, Daniel Mohler, Andreas Schäfer

备注：
27 pages, 29 figures, 11 tables
发表信息：
Phys.Rev. D82 (2010) 034505
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摘要：

本文给出了在具有两个质量简并轻海夸克的16**3 × 32格点上用手征改进的狄拉克算符计算介子和重子谱的结果。研究了质量分别为322（5）、470（4）和525（7）MeV，晶格间距接近0.15fm的三个系综。给出了几个通道的基态和激发态的计算结果，包括自旋为2的介子和含奇异价夸克的强子。用变分法分析了高斯源和导数源的状态。我们得到了几个基态相当精确，并发现在各种渠道的径向激发。激发重子的结果似乎受到有限尺寸效应的影响，特别是在小π介子质量。我们讨论了可能出现的散射状态在各种渠道，考虑质量和本征矢量。标量通道中的部分猝灭结果表明存在2粒子态，然而，在大多数通道中，我们无法识别它们。在可用的情况下，我们将我们的结果与使用相同动作的淬火模拟结果进行比较。

英文摘要：

We present results of meson and baryon spectroscopy using the Chirally Improved Dirac operator on lattices of size 16**3 x 32 with two mass-degenerate light sea quarks. Three ensembles with pion masses of 322(5), 470(4) and 525(7) MeV and lattice spacings close to 0.15 fm are investigated. Results on ground and excited states for several channels are given, including spin two mesons and hadrons with strange valence quarks. The analysis of the states is done with the variational method, including two kinds of Gaussian sources and derivative sources. We obtain several ground states fairly precisely and find radial excitations in various channels. Excited baryon results seem to suffer from finite size effects, in particular at small pion masses. We discuss the possible appearance of scattering states in various channels, considering masses and eigenvectors. Partially quenched results in the scalar channel suggest the presence of a 2-particle state, however, in most channels we cannot identify them. Where available, we compare our results to results of quenched simulations using the same action.

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