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arXiv 0707.4037hep-ph
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费曼图与微分方程

Feynman Diagrams and Differential Equations

Mario Argeri, Pierpaolo Mastrolia

摘要:

我们回顾在教学的方式微分方程的方法D维调节费曼积分的评价。在讨论了该技术的一般特征后,我们讨论了它在QED中光子传播子的单圈和双圈修正中的应用,通过精确计算D中的真空极化张量。最后,我们处理两种情况下,少平凡微分方程,分别与一个两圈三点,和一个四圈两点积分。这两个例子是展示更多技术方面的游乐场:D中微分方程的洛朗展开(D=4左右);边界条件的选择;以及费曼积分微分方程和差分方程之间的联系。

英文摘要:

We review in a pedagogical way the method of differential equations for the evaluation of D-dimensionally regulated Feynman integrals. After dealing with the general features of the technique, we discuss its application in the context of one- and two-loop corrections to the photon propagator in QED, by computing the Vacuum Polarization tensor exactly in D. Finally, we treat two cases of less trivial differential equations, respectively associated to a two-loop three-point, and a four-loop two-point integral. These two examples are the playgrounds for showing more technical aspects about: Laurent expansion of the differential equations in D (around D=4); the choice of the boundary conditions; and the link among differential and difference equations for Feynman integrals.

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