Precise Determination of the Strong Coupling Constant at NNLO in QCD from the Three-Jet Rate in Electron-Positron Annihilation at LEP
Precise Determination of the Strong Coupling Constant at NNLO in QCD from the Three-Jet Rate in Electron-Positron Annihilation at LEP
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从 LEP 正负电子湮灭中的三射流速率精确确定 QCD 中 NNLO 的强耦合常数
DOI：
10.1103/physrevlett.104.072002
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发表时间：
2010
影响因子：
8.6
通讯作者：
Dissertori G
中科院分区：
文献类型：
--
作者：
Dissertori G
本文首次利用近-近-领先阶（NNLO）微扰QCD预言，从LEP湮灭中的三喷流速率确定了强耦合常数。更准确地说，我们提取通过拟合微扰QCD预测从ALEPH实验在LEP。在很大范围内的喷流分辨率参数，这个观察的特点是小的非微扰修正和重整化尺度变化下的良好的稳定性。我们发现αs（MZ）=0.1175±0.0020（expt）±0.0015（theor），这比目前世界上使用的泡沫形状数据的平均值更精确。
We present the first determination of the strong coupling constant from the three-jet rate inannihilation at LEP, based on a next-to-next-to-leading-order (NNLO) perturbative QCD prediction. More precisely, we extractby fitting perturbative QCD predictions atto data from the ALEPH experiment at LEP. Over a large range of the jet-resolution parameter, this observable is characterized by small nonperturbative corrections and an excellent stability under renormalization scale variation. We find αs(MZ)=0.1175±0.0020(expt)±0.0015(theor), which is more accurate than the values offromevent-shape data currently used in the world average.