Five-loop contributions to low-N non-singlet anomalous dimensions in QCD

Five-loop contributions to low-N non-singlet anomalous dimensions in QCD
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五环对 QCD 中低 N 非单态反常维度的贡献

DOI:
10.1016/j.physletb.2019.01.060
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发表时间:
2019
期刊:
影响因子:
4.4
通讯作者:
A. Vogt
A. Vogt
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
F. Herzog;S. Moch;B. Ruijl;T. Ueda;J.A.M. Vermaseren;A. Vogt

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首次计算了微扰QCD中N4 LO对自旋N扭2算符反常维数的贡献.具体地说,在强耦合α s中,我们分别得到了N= 2和N= 3到5阶的非单重夸克-夸克反常维数。这些结果确定了N4 LO对小x区域外强子非单重态夸克分布演化的贡献尺度,并便于一次近似确定五圈尖点反常维数.虽然N4 LO系数大于低阶结果的预期值,但它们的加入使三种或更多种轻口味的微扰展开稳定在α s< 0.3的亚百分比精度。
We present the first calculations of next-to-next-to-next-to-next-to-leading order (N 4 LO) contributions to anomalous dimensions of spin-N twist-2 operators in perturbative QCD. Specifically, we have obtained the respective non-singlet quark–quark anomalous dimensions at N= 2 and N= 3 to the fifth order in the strong coupling α s. These results set the scale for the N 4 LO contributions to the evolution of the non-singlet quark distributions of hadrons outside the small-x region, and facilitate a first approximate determination of the five-loop cusp anomalous dimension. While the N 4 LO coefficients are larger than expected from the lower-order results, their inclusion stabilizes the perturbative expansions for three or more light flavours at a sub-percent accuracy for α s< 0.3.
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