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arXiv 0905.4891hep-ex
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来自Jade事件队列的alpha_s(MZ)

alpha_s(MZ) from Jade Event Shapes

S. Kluth

摘要:

本文利用JADE实验在sqrt(s)=14 ~ 44 GeV之间收集的e+e-湮没成强子的事例形状数据,确定强耦合α_S。使用QCD预测完全到次领先阶(NLLO),或者与次领先对数近似(NLLA)相结合。的NNLO和NNLO+NLLA的结果相对于重整化规模的变化的稳定性得到改善,与以前的结果与下一个领导阶(NLO)或NLO+NLLA预测。α_S的能量依赖性与QCD的渐近自由预言一致,排除了99%置信水平的不存在运行。

英文摘要:

Event shape data from e+e- annihilation into hadrons collected by the JADE experiment between sqrt(s)=14 and 44 GeV are used to determine the strong coupling alpha_S. QCD predictionscomplete to next-to-next-to-leading order (NLLO), alternatively combined with next-to-leading-log-approximation (NLLA) are used. The stability of the NNLO and NNLO+NLLA results with respect to variations of the renormalisation scale is improved compared to previous results obtained with next-to-leading-order (NLO) or NLO+NLLA predictions. The energy dependence of alpha_S agrees with the QCD prediction of asymptotic freedom and excludes absence of running with 99% confidence level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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