A simultaneous measurement of the QCD colour factors and the strong coupling
A simultaneous measurement of the QCD colour factors and the strong coupling
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DOI：
10.1007/s100520100699
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发表时间：
2001-05-01
影响因子：
4.4
通讯作者：
Zer-Zion, D
中科院分区：
文献类型：
--
作者：
Abbiendi, G;Ainsley, C;Zer-Zion, D
利用1991 ~ 1995年在LEP的OPAL探测器上获得的e（+）e（-）湮灭成强子的数据，我们同时测量了强相互作用C-F和C-A以及强耦合α（s）的基本规范群的色因子。测量进行了拟合次领先阶微扰预测测得的角度相关的4喷流事件与多喷流相关变量。我们的结果，C-A = 3.02 +/- 0.25（统计）。+/- 0.49（系统），CF = 1.34 +/- 0.13（统计）+/- 0.22（系统），α（s）（M-Z）= 0.120 +/- 0.011（统计）+/- 0.020（系统，），提供了微扰QCD的测试，其中唯一的假设是非阿贝尔规范对称性和标准强子化模型。测量结果与SU（3）对C-F和C-A的预期以及α（s）（M-Z）的世界平均值一致。
Using data from e(+)e(-) annihilation into hadrons, taken with the OPAL detector at LEP at the Z pole between 1991 and 1995, we performed a simultaneous measurement of the colour factors of the underlying gauge group of the strong interaction, C-F and C-A, and the strong coupling, alpha (s). The measurement was carried out by fitting next-to-leading order perturbative predictions to measured angular correlations of 4-jet events together with multi-jet related variables. Our results,C-A = 3.02 +/- 0.25(stat.) +/- 0.49(syst.), CF = 1.34 +/- 0.13(stat.) +/- 0.22(syst.),alpha (s) (M-Z) = 0.120 +/- 0.011(stat.) +/- 0.020(syst,),provide a test of perturbative QCD in which the only assumptions are non-abelian gauge symmetry and standard hadronization models. The measurements are in agreement with SU(3) expectations for C-F and C-A and the world average of alpha (s)(M-Z).