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arXiv 0704.1937hep-lathep-exhep-ph
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非猝灭格点量子色动力学中的轻夸克质量

Light quark masses from unquenched lattice QCD

JLQCD Collaboration, T. Ishikawa, S. Aoki, M. Fukugita, S. Hashimoto, K-I. Ishikawa, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneko, Y. Kuramashi, M. Okawa, Y. T… 展开作者

JLQCD Collaboration, T. Ishikawa, S. Aoki, M. Fukugita, S. Hashimoto, K-I. Ishikawa, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneko, Y. Kuramashi, M. Okawa, Y. Taniguchi, N. Tsutsui, A. Ukawa, N. Yamada, T. Yoshié

摘要:

我们用格点量子色动力学模拟计算了轻介子谱和轻夸克质量,对所有的轻夸克进行了动力学处理,采用了Iwasaki胶子作用量和非微扰O(a)改进的Wilson夸克作用量.计算是在等距离a^2~0.005、0.01和0.015 fm^2的晶格间距平方下进行的,假设离散化误差为O(a^2),取连续极限。轻介子谱与实验结果一致。在\bar{MS}方案中,2GeV处上、下和奇异夸克的质量分别为:\bar{m} =(m_{u} + m_{d})/2=3.55^{+0.65}-0.28} MeV和m_s=90.1^{+17.2}-6.1} MeV,其中误差包括统计误差和正交叠加的所有系统误差.这些值包含了之前用动力学u和d夸克得到的误差估计。

英文摘要:

We calculate the light meson spectrum and the light quark masses by lattice QCD simulation, treating all light quarks dynamically and employing the Iwasaki gluon action and the nonperturbatively O(a)-improved Wilson quark action. The calculations are made at the squared lattice spacings at an equal distance a^2~0.005, 0.01 and 0.015 fm^2, and the continuum limit is taken assuming an O(a^2) discretization error. The light meson spectrum is consistent with experiment. The up, down and strange quark masses in the \bar{MS} scheme at 2 GeV are \bar{m}=(m_{u}+m_{d})/2=3.55^{+0.65}_{-0.28} MeV and m_s=90.1^{+17.2}_{-6.1} MeV where the error includes statistical and all systematic errors added in quadrature. These values contain the previous estimates obtained with the dynamical u and d quarks within the error.

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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