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arXiv 0810.2933hep-ex
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用\Jade的\epem湮灭数据研究同相轴形状矩和确定\as

Study of moments of event shapes and a determination of \as using \epem annihilation data from \Jade

Christoph Pahl, Siegfried Bethke, Stefan Kluth, Jochen Schieck

备注：
14 pages, 9 figures, EPHJA style, acc. by Eur.Phys.J.C. New version similar to published version
发表信息：
Eur.Phys.J.C60:181-196,2009; Erratum-ibid.C62:451-452,2009
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摘要：

利用\Jade实验收集的质心能量在14 GeV ~ 44 GeV之间的\epem湮没成强子的数据，研究了事件形状分布的矩。强子化参数调整到LEP 1精度数据的模型提供了一个足够的描述低能量的数据研究。然而，非线性光学QCD计算，显示系统的一些时刻的缺陷。由NLO QCD合理描述的矩测量的强耦合，\asmz =0.1287 \pm 0.0007 \stat \pm 0.0011 \expt \pm 0.0022 \had \pm 0.0075 \theo与世界平均值一致。

英文摘要：

Data from \epem annihilation into hadrons, collected by the \Jade experiment at centre-of-mass energies between 14 GeV and 44 GeV, are used to study moments of event shape distributions. Models with hadronisation parameters tuned to the LEP 1 precision data provide an adequate description of the low energy data studied here. The NLO QCD calculations, however, show systematic deficiencies for some of the moments. The strong coupling measured from the moments which are reasonably described by NLO QCD, \asmz=0.1287\pm0.0007\stat\pm0.0011\expt\pm0.0022\had\pm0.0075\theo is consistent with the world average.

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