标题： 将优化摄动理论应用于低能QCD 显示英文标题

标题： Applying Optimized Perturbation Theory to QCD at Low Energies

摘要： 我们讨论了基于最小敏感性原理的优化方法在{\mbox{${R_{e^+e^-}}$}}三阶计算中的应用。该有效耦合常数保持有限值，使我们能够将 Poggio-Quinn-Weinberg 涂抹方法应用于低于 1 GeV 的能量区域，在此区域内理论与实验结果具有良好的一致性。该耦合常数在零能点冻结于$\alpha_s/\pi = 0.26$值上，这一结果与现象学得到的值高度一致。 显示英文摘要

摘要： We discuss the use of the optimization procedure based on the Principle of Minimal Sensitivity to the third-order calculation of {\mbox{${R_{e^+e^-}}$}}. The effective coupling constant remains finite allowing us to apply the Poggio-Quinn-Weinberg smearing method down to energies below 1 GeV, where we find good agreement between theory and experiment. The couplant freezes to a value of $\alpha_s/\pi = 0.26$ at zero energy which is in remarkable concordance with values obtained phenomenologically.