Vertex diagrams for the QED form factors at the 2-loop level

Vertex diagrams for the QED form factors at the 2-loop level
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DOI:
10.1016/j.nuclphysb.2004.08.009
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发表时间:
2003-01
期刊:
Nuclear Physics
影响因子:
--
通讯作者:
R. Bonciani;P. Mastrolia;U. E.RemiddiFreiburg;U. Bologna;U. Karlsruhe;Infn
R. Bonciani;P. Mastrolia;U. E.RemiddiFreiburg;U. Bologna;U. Karlsruhe;Infn
中科院分区:
其他
文献类型:
--
作者:
R. Bonciani;P. Mastrolia;U. E.RemiddiFreiburg;U. Bologna;U. Karlsruhe;Infn

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我们对连续 D 维正则化方案中 QED 中电子顶点发生的所有 2 环积分进行了系统研究,对于壳层电子,动量传递 t=−Q2 和有限平方电子质量 me2=a。我们确定问题的所有主积分(MI),并在 Q2 中写出它们满足的微分方程。这些方程以 ϵ=(4−D)/2 的幂展开,并通过常量变分的欧拉方法求解。结果,我们获得了高达零阶的 MI 的 ϵ 洛朗展开系数,以调和多对数的近似解析形式表示。
We carry out a systematic investigation of all the 2-loop integrals occurring in the electron vertex in QED in the continuous D-dimensional regularization scheme, for on-shell electrons, momentum transfer t=−Q2and finite squared electron mass me2=a. We identify all the master integrals (MIs) of the problem and write the differential equations in Q2which they satisfy. The equations are expanded in powers of ϵ=(4−D)/2 and solved by the Euler's method of the variation of the constants. As a result, we obtain the coefficients of the Laurent expansion in ϵ of the MIs up to zeroth order expressed in close analytic form in terms of harmonic polylogarithms.