论文标题
使用事件形状平均值来确定$α_{s} $以外的nnlo
Determination of $α_{S}$ beyond NNLO using event shape averages
论文作者
论文摘要
我们考虑了一种使用拟合QCD强耦合常数的方法，该方法使用对LEP，PETRA，PEP和TRISTAN COLLIDERS收集的数据的扰动预测进行拟合。为了获得最高的准确性预测，我们使用扰动$ {\ cal {o}}（α_{s}^{3}）$计算和估计的组合，$ {\ cal {o}}（α___________}^{4}）$扰动系数。我们使用现代蒙特卡洛事件发生器和分析强化模型来解释非扰动效应。获得的结果表明，仅使用高阶扰动QCD校正，不能显着改善$α_{s} $确定的总精度，但主要需要更深入地了解非扰动效应。
We consider a method for determining the QCD strong coupling constant using fits of perturbative predictions for event shape averages to data collected at the LEP, PETRA, PEP and TRISTAN colliders. To obtain highest accuracy predictions we use a combination of perturbative ${\cal{O}}(α_{S}^{3})$ calculations and estimations of the ${\cal{O}}(α_{S}^{4})$ perturbative coefficients from data. We account for non-perturbative effects using modern Monte Carlo event generators and analytic hadronization models. The obtained results show that the total precision of the $α_{S}$ determination cannot be improved significantly with the higher order perturbative QCD corrections alone, but primarily requires a deeper understanding of the non-perturbative effects.
