arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.04195hep-ph
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平面五点单质量过程的双圈积分

Two-Loop Integrals for Planar Five-Point One-Mass Processes

S. Abreu, H. Ita, F. Moriello, B. Page, W. Tschernow, M. Zeng

摘要:

本文给出了一个带外质量的平面五点双环主积分的计算方法。这些积分是QCD中主导色处双喷流相关W玻色子产生的双环散射振幅的重要组成部分。我们提供了一组纯积分连同微分方程的标准形式。我们得到解析微分方程有效地从有限域上的数值样本,拟合从符号字母建立的anananterior。符号字母表本身是从切微分方程,我们发现,它可以写在一个非常紧凑的形式。我们评论的积分的分析性质,并确认扩展的Steinmann关系,管理费曼积分的双重不连续性,在$ε$的所有订单。我们解决的微分方程的广义幂级数的单参数轮廓的Mandelivery不变量的空间。这种形式的解决方案平凡化的解析延拓和积分可以评估在所有的运动区域与任意的数值精度。

英文摘要:

We present the computation of a full set of planar five-point two-loop master integrals with one external mass. These integrals are an important ingredient for two-loop scattering amplitudes for two-jet-associated W-boson production at leading color in QCD. We provide a set of pure integrals together with differential equations in canonical form. We obtain analytic differential equations efficiently from numerical samples over finite fields, fitting an ansatz built from symbol letters. The symbol alphabet itself is constructed from cut differential equations and we find that it can be written in a remarkably compact form. We comment on the analytic properties of the integrals and confirm the extended Steinmann relations, which govern the double discontinuities of Feynman integrals, to all orders in $ε$. We solve the differential equations in terms of generalized power series on single-parameter contours in the space of Mandelstam invariants. This form of the solution trivializes the analytic continuation and the integrals can be evaluated in all kinematic regions with arbitrary numerical precision.

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