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arXiv 0711.3590hep-ph
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费米对无质量三圈形状因子贡献的主积分

Master Integrals for Fermionic Contributions to Massless Three-Loop Form Factors

G. Heinrich, T. Huber, D. Maitre

摘要:

在这封信中,我们继续计算无质量三圈形状因子的主积分,给出与费米子贡献成正比于N_F^2、N_F*N和N_F/N的那些积分的解析结果。在维正则化的工作,我们表示一个积分在一个封闭的形式,这是确切的所有订单在ESTA,包含伽玛函数和超几何函数的单位参数。在所有其他情况下,我们得到多个梅林-巴恩斯表示,从其中的系数的洛朗展开在λ中提取的分析形式。为了得到三圈夸克和胶子形状因子的有限部分,必须包括黎曼ζ函数中通过超越性6的所有系数。

英文摘要:

In this letter we continue the calculation of master integrals for massless three-loop form factors by giving analytical results for those integrals which are relevant for the fermionic contributions proportional to N_F^2, N_F*N, and N_F/N. Working in dimensional regularisation, we express one of the integrals in a closed form which is exact to all orders in epsilon, containing Gamma-functions and hypergeometric functions of unit argument. In all other cases we derive multiple Mellin-Barnes representations from which the coefficients of the Laurent expansion in epsilon are extracted in an analytical form. To obtain the finite part of the three-loop quark and gluon form factors, all coefficients through transcendentality six in the Riemann zeta-function have to be included.

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