Precision computation of the strange quark's mass in quenched QCD

Precision computation of the strange quark's mass in quenched QCD
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淬灭QCD中奇异夸克质量的精确计算

DOI:
10.1016/s0550-3213(99)00714-2
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发表时间:
1999
期刊:
Nuclear Physics
影响因子:
--
通讯作者:
H. Wittig
H. Wittig
中科院分区:
--
文献类型:
--
作者:
J. Garden;J. Heitger;R. Sommer;H. Wittig

文献摘要

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在QCD的猝灭近似下,我们以K介子的质量作为基本输入,确定了对应于奇异夸克质量和平均轻夸克质量之和的重整化群不变夸克质量。在连续极限下,我们发现(Ms+ M)/FK=0.874(29),其中包括系统误差。在μ= 2GeV时,将这个非微扰结果转化为MS方案中的夸克运行质量,并利用手征微扰理论中的夸克质量比,得到ms(2GeV)=97(4)MeV .根据CP-PACS协作组最近的研究结果,我们估计如果用核子质量代替FK来设置标度,将获得10%的高值。这是猝灭近似中典型的模糊性。
We determine the renormalization group invariant quark mass corresponding to the sum of the strange and the average light quark mass in the quenched approximation of QCD, using as essential input the mass of the K-mesons. In the continuum limit we find (Ms+ M ̂ )/FK=0.874(29) , which includes systematic errors. Translating this non-perturbative result into the running quark masses in the MS scheme at μ=2 GeV and using the quark mass ratios from chiral perturbation theory, we obtain ms(2 GeV )=97(4) MeV . With the help of recent results by the CP-PACS Collaboration, we estimate that a 10% higher value would be obtained if one replaced FKby the nucleon mass to set the scale. This is a typical ambiguity in the quenched approximation.