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arXiv 0901.0837math-phhep-phhep-thmath.AGmath.MP
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权w=6时调和和与Mellin变换的结构关系

Structural Relations of Harmonic Sums and Mellin Transforms at Weight w=6

Johannes Blümlein

摘要:

本文导出了权为{ \sf w = 6}的Nielsen积分和调和多项式的套调和和与相应的Mellin变换之间的结构关系。它们出现在QED和QCD中无质量单尺度量的计算中,如反常尺寸和Wilson系数,到3-和4-圈级。我们考虑权为6的多重调和和的集合,而没有指标$\{-1\}$。这个限制对于所有已知的物理情况是足够的。结构关系补充代数关系,由于调和和之间的洗牌产品,研究较早。在权重{ \sf w = 6}处贡献的486个可能谐波和的原始量减少到99个没有索引$\{-1\}$的和。代数和结构关系导致进一步减少到20个基本功能。这些函数补充了15个基本函数的集合,直到前面导出的权重{ \sf w = 5}。给出了求复平面上基本和的解析表示的算法。

英文摘要:

We derive the structural relations between nested harmonic sums and the corresponding Mellin transforms of Nielsen integrals and harmonic polylogarithms at weight {\sf w = 6}. They emerge in the calculations of massless single--scale quantities in QED and QCD, such as anomalous dimensions and Wilson coefficients, to 3-- and 4--loop order. We consider the set of the multiple harmonic sums at weight six without index $\{-1\}$. This restriction is sufficient for all known physical cases. The structural relations supplement the algebraic relations, due to the shuffle product between harmonic sums, studied earlier. The original amount of 486 possible harmonic sums contributing at weight {\sf w = 6} reduces to 99 sums with no index $\{-1\}$. Algebraic and structural relations lead to a further reduction to 20 basic functions. These functions supplement the set of 15 basic functions up to weight {\sf w = 5} derived formerly. We line out an algorithm to obtain the analytic representation of the basic sums in the complex plane.

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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