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arXiv 0709.0777hep-ph
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具有红外发散的标量单圈积分的精确数值计算

Precise Numerical Evaluation of the Scalar One-Loop Integrals with the Infrared Divergence

F. Yuasa, E. de Doncker, J. Fujimoto, N. Hamaguchi, T. Ishikawa, Y. Shimizu

摘要:

我们提出了一种新的方法,获得非常精确的积分结果的红外顶点和盒图,其中的集成是直接进行,而不进行任何分析积分的费曼参数。采用适当的数值积分程序和外推方法,结合多精度库,我们得到了与解析结果一致到10位数的积分结果,即使对于红外顶角图中的$10^{-150}$ GeV这样很小的光子质量也是如此。

英文摘要:

We present a new approach for obtaining very precise integration results for infrared vertex and box diagrams, where the integration is carried out directly without performing any analytic integration of Feynman parameters. Using an appropriate numerical integration routine with an extrapolation method, together with a multi-precision library, we have obtained integration results which agree with the analytic results to 10 digits even for such a very small photon mass as $10^{-150}$ GeV in the infrared vertex diagram.

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