Computation of the strong coupling in QCD with two dynamical flavors
Computation of the strong coupling in QCD with two dynamical flavors
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DOI：
10.1016/j.nuclphysb.2005.02.013
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
M. Morte;R. Frezzotti;J. Heitger;J. Rolf;R. Sommer;U. Wolff
中科院分区：
文献类型：
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作者：
M. Morte;R. Frezzotti;J. Heitger;J. Rolf;R. Sommer;U. Wolff
本文在薛定谔泛函方法下，对量子色动力学中两种动力学费米子的耦合α的运行进行了非微扰计算。我们改进了我们以前的结果，一个可靠的连续外推。表征高能运转的Λ参数与连续极限下低能耦合的大小有关。使用晶格间距a从0.07 fm到0.1 fm的大体积数据给出了Λ r 0的估计。它转换为ΛMS <$（2）=245（16）（16）MeV [假设r 0 =0.5 fm]。最后一步仍需改进，以减少不确定性。
We present a non-perturbative computation of the running of the coupling αsin QCD with two flavors of dynamical fermions in the Schrödinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Λ-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Λr0is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into ΛMS¯(2)=245(16)(16) MeV [assuming r0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.