标题： QCD中具有两个动态味的强耦合计算 显示英文标题

标题： Computation of the strong coupling in QCD with two dynamical flavours

摘要： 我们提出了在施罗丁格函数方案中，具有两种动态费米子的QCD中耦合常数alpha_s的非微扰计算。 我们通过可靠的连续极限外推改进了之前的结果。 表征高能运行的Lambda参数与连续极限下低能处的耦合常数值相关。 使用晶格间距a从0.07飞米到0.1飞米的大体积数据给出了Lambda*r_0的估计值。 这转化为Lambda_{MSbar}^{(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。 显示英文摘要

摘要： We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.