Numerical evaluation of two-loop integrals in FDR

Numerical evaluation of two-loop integrals in FDR
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FDR 中二环积分的数值计算

DOI:
10.1007/jhep02(2016)029
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发表时间:
2015
影响因子:
5.4
通讯作者:
T. Zirke
T. Zirke
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Zirke

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本文提出了一种在四维正则化/重整化方法中数值计算红外有限单圈和双圈积分的方法,其中小质量作为调节器。典型的积分表现出对数依赖于这个质量,我们提取的援助下,可以很容易地集成分析,直到对数结构被揭示适当的减法项。作为检验该方法的第一个物理应用,我们计算了在无限顶夸克质量的极限下标量和赝标量Higgs玻色子衰变为两个光子的速率以及ρ参数的QCD修正。
A bstractWe present a method to numerically evaluate infrared-finite one- and two-loop integrals within the Four-Dimensional Regularization/Renormalization approach, in which a small mass serves as regulator. Typical integrals exhibit a logarithmic dependence on this mass, which we extract with the aid of suitable subtraction terms that can easily be integrated analytically until the logarithmic structure is revealed. As first physical applications to test the method, we calculate QCD corrections to the decay rates of scalar and pseudoscalar Higgs bosons into two photons in the limit of an infinite top-quark mass as well as to the ρ parameter.
FORM 的多线程版本
DOI: 10.1016/j.cpc.2010.04.009
发表时间: 2010
期刊: Comput. Phys. Commun.
影响因子: --
作者:
M. Tentyukov;J. A. M. Vermaseren
通讯作者: J. A. M. Vermaseren