arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.07987hep-ph
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用辅助质量流计算Feynman回路积分和相空间积分

Calculation of Feynman loop integration and phase-space integration via auxiliary mass flow

Xiao Liu, Yan-Qing Ma, Wei Tao, Peng Zhang

摘要:

我们扩展了最初为费曼回路积分而开发的非线性质量流(AMF)方法,以计算涉及相空间积分的积分。辅助质量从边界($\infty$)到物理点($0^+$)的流动通过数值求解关于辅助质量的微分方程来获得。对于具有两个或多个运动学不变量的问题,AMF方法通过提供系统边界条件和高度非平凡的自洽检验,可以与传统的微分方程方法相结合。该方法详细描述了$e^+e^-\rightarrow γ^* \rightarrow t\bar{t}+X$在NNLO教学的例子。我们表明,AMF方法可以系统和有效地计算积分,以高精度。

英文摘要:

We extend the auxiliary-mass-flow (AMF) method originally developed for Feynman loop integration to calculate integrals involving also phase-space integration. Flow of the auxiliary mass from the boundary ($\infty$) to the physical point ($0^+$) is obtained by numerically solving differential equations with respective to the auxiliary mass. For problems with two or more kinematical invariants, the AMF method can be combined with traditional differential equation method by providing systematical boundary conditions and highly nontrivial self-consistent check. The method is described in detail with a pedagogical example of $e^+e^-\rightarrow γ^* \rightarrow t\bar{t}+X$ at NNLO. We show that the AMF method can systematically and efficiently calculate integrals to high precision.

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。

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