arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1812.03060hep-ph
收藏

用微分方程数值计算多圈Feynman积分

Evaluating multi-loop Feynman integrals numerically through differential equations

Manoj K. Mandal, Xiaoran Zhao

摘要:

费曼积分的计算往往是多回路计算的瓶颈。我们提出并实现了一种新的方法来有效地评估这样的积分在物理区域通过数值积分的一组合适的微分方程,其中初始条件提供在非物理区域通过扇区分解方法。我们给出了一组双圈积分的数值结果,其中非平面积分完成了顶夸克介导的$gg\toγγ$和$q\bar{q}\toγγ$散射的主积分。

英文摘要:

The computation of Feynman integrals is often the bottleneck of multi-loop calculations. We propose and implement a new method to efficiently evaluate such integrals in the physical region through the numerical integration of a suitable set of differential equations, where the initial conditions are provided in the unphysical region via the sector decomposition method. We present numerical results for a set of two-loop integrals, where the non-planar ones complete the master integrals for $gg\toγγ$ and $q\bar{q}\toγγ$ scattering mediated by the top quark.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑