从强子τ衰变中提取强耦合
On the Extraction of the Strong Coupling from Hadronic Tau Decay
摘要：
从强子τ衰变数据中提取强耦合α s的有限能量和规则提供了最精确的实验测定之一。随着精度的提高，小的非微扰效应变得越来越与中心值和误差相关。在这里，我们提出了一个新的框架，这种提取采用物理动机的模型，以适应违反夸克-强子的对偶性，并执行一致的治疗高维算子乘积展开的贡献。利用1998年OPAL的非奇异矢量谱函数和轴矢量谱函数数据，我们发现固定阶微扰理论和轮廓改进微扰理论的α_s（m_τ^2）的nf =3值分别为0.307（19）和0.322（26），对应于α_s（M_Z^2）的nf =5值分别为0.1169（25）和0.1187（32）。
英文摘要：
The finite energy sum rule extraction of the strong coupling α_s from hadronic τ decay data provides one of its most precise experimental determinations. As precision improves, small non-perturbative effects become increasingly relevant to both the central value and error. Here we present a new framework for this extraction employing a physically motivated model to accommodate violations of quark-hadron duality and enforcing a consistent treatment of higher-dimension operator product expansion contributions. Using 1998 OPAL data for the non-strange vector and axial-vector spectral functions, we find the n_f=3 values for α_s(m_τ^2) of 0.307(19) for fixed-order perturbation theory and 0.322(26) for contour-improved perturbation theory, corresponding to n_f=5 values for α_s(M_Z^2) of 0.1169(25) and 0.1187(32), respectively.
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