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Infinite-order scale-setting using the principle of maximum conformality: A remarkably efficient method for eliminating renormalization scale ambiguities for perturbative QCD
Physical Review D ( IF 4.6 ) Pub Date : 2020-07-10 , DOI: 10.1103/physrevd.102.014015
Leonardo Di Giustino , Stanley J. Brodsky , Sheng-Quan Wang , Xing-Gang Wu

We identify a property of renormalizable SU(N)/U(1) gauge theories, the intrinsic Conformality ($iCF$), which underlies the scale invariance of physical observables and leads to a remarkably efficient method to solve the conventional renormalization scale ambiguity at every order in pQCD: the PMC$_\infty$. This new method reflects the underlying conformal properties displayed by pQCD at NNLO, eliminates the scheme dependence of pQCD predictions and is consistent with the general properties of the PMC (Principle of Maximum Conformality). We introduce a new method to identify conformal and $\beta$-terms which can be applied either to numerical or to theoretical calculations. We illustrate the PMC$_\infty$ for the thrust and C-parameter distributions in $e^+ e^-$ annihilation and then we show how to apply this new method to general observables in QCD. We point out how the implementation of the PMC$_\infty$ can significantly improve the precision of pQCD predictions; its implementation in multi-loop analysis also simplifies the calculation of higher orders corrections in a general renormalizable gauge theory.

中文翻译:

使用最大保形原则的无限阶尺度设置:一种消除微扰 QCD 重整化尺度模糊的非常有效的方法

我们确定了可重整化 SU(N)/U(1) 规范理论的一个属性,即内在共形 ($iCF$),它是物理可观测量的尺度不变性的基础,并导致了一种非常有效的方法来解决在pQCD 中的每个订单:PMC$_\infty$。这种新方法反映了 pQCD 在 NNLO 显示的潜在共形特性,消除了 pQCD 预测的方案依赖性,并且与 PMC(最大共形性原则)的一般特性一致。我们引入了一种新的方法来识别保形和 $\beta$ 项,可以应用于数值或理论计算。我们说明了 $e^+ e^-$ 湮灭中推力和 C 参数分布的 PMC$_\infty$,然后我们展示了如何将这种新方法应用于 QCD 中的一般可观测量。我们指出 PMC$_\infty$ 的实现如何显着提高 pQCD 预测的精度;它在多环分析中的实现也简化了一般可重整规范理论中高阶修正的计算。
更新日期:2020-07-10
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