A determination of the Lambda parameter from full lattice QCD

A determination of the Lambda parameter from full lattice QCD
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从全晶格 QCD 确定 Lambda 参数

DOI:
10.1103/physrevd.73.014513
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发表时间:
2005
期刊:
影响因子:
5
通讯作者:
H. Stüben
H. Stüben
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Göckeler;R. Horsley;A. Irving;D. Pleiter;P. Rakow;G. Schierholz;H. Stüben

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本文给出了在猝灭近似下(n_f=0)和两种味(n_f=2)轻动力学夸克的QCD参量λ的确定。在晶格上使用O(a)改进的Wilson费米子进行计算,包括取连续极限。我们发现Lambda_{n_f=0} = 259(1)(20)MeV和Lambda_{n_f=2} = 261(17)(26)MeV,使用r_0 = 0.467 fm设置标度。将我们的结果外推到五种情况,我们得到Z玻色子质量的运行耦合常数α_s(m_Z)= 0.112(1)(2)。所有数字均指MSbar方案。
We present a determination of the QCD parameter Lambda in the quenched approximation (n_f=0) and for two flavours (n_f=2) of light dynamical quarks. The calculations are performed on the lattice using O(a) improved Wilson fermions and include taking the continuum limit. We find Lambda_{n_f=0} = 259(1)(20) MeV and Lambda_{n_f=2} = 261(17)(26) MeV}, using r_0 = 0.467 fm to set the scale. Extrapolating our results to five flavours, we obtain for the running coupling constant at the mass of the Z boson alpha_s(m_Z) = 0.112(1)(2). All numbers refer to the MSbar scheme.