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arXiv 1306.3504hep-phhep-th
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光Nf对gg->tt贡献的大量平面和非平面双盒积分

Massive planar and non-planar double box integrals for light Nf contributions to gg->tt

Andreas von Manteuffel, Cedric Studerus

摘要:

我们提出了胶子熔合通道中顶夸克对产生的光费米子双环修正所需的主积分。通过微分方程的方法,我们计算结果的多个多项式在一个罗朗级数约d=4,其中d是时空维。最复杂的拓扑结构是一个非平面的双盒与一个内部质量。我们采用的协积增广符号演算,并表明显着的简化是可能的选择的结果,使用一组优化的多个polyacrylms。

英文摘要:

We present the master integrals needed for the light fermionic two-loop corrections to top quark pair production in the gluon fusion channel. Via the method of differential equations we compute the results in terms of multiple polylogarithms in a Laurent series about d=4, where d is the space-time dimension. The most involved topology is a non-planar double box with one internal mass. We employ the coproduct-augmented symbol calculus and show that significant simplifications are possible for selected results using an optimised set of multiple polylogarithms.

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