圈积分及相空间积分计算系列讲座

Session

解析计算

30 Oct 2020, 01:00

45161188005 (腾讯会议)

Conveners

解析计算

• 杨李林 ()

Contribution list Timetable

4. Introduction to differential equation method for Feynman integral

徐小峰

30/10/2020, 01:00

Feynman integrals are one of the important ingredients to provide precise theoretical predictions for process at the LHC. Recently, there is significant progress in calculating Feynman integrals using differential equation method. In this lecture, I will introduce the canonical form of differential equations, the corresponding integrals called canonical basis, and I will discuss how to solve...

8. Analytic calculation--traditional methods for integrals

Dr Guo-Xing Wang

30/10/2020, 02:00

传统的积分方法在历史上起到了非常重要的作用。尽管目前微分方程的方法非常流行也非常强大，但是依然需要利用其它方法确定其边界条件。此外，在一些有效理论中出现的积分，微分方程的方法并不能很好的适用。此时，这些传统的方法便成为非常重要的处理手段。本次报告主要介绍三种传统的积分方法：parameterization，Mellin Barnes representation，Asymptotic expansions. 在报告中，报告人将分别介绍这些方法的基本概念和一些常用公式，并以一些简单的例子介绍如何在具体计算中使用这些积分方法。

14. Regularization and calculation of rapidity divergent Feynman integrals systematically

Dr Tong-Zhi Yang

30/10/2020, 03:00

22. Bootstrapping a two-loop four-point form factor

Prof. Gang Yang

30/10/2020, 04:00

We explain a recent computation of a two-loop four-point form factor in planar N=4 SYM, which belongs to the class of two-loop five-point scattering observables with one off-shell color-singlet leg. A new bootstrapping strategy is developed to obtain this result by starting with an ansatz expanded in terms of master integrals and then solving the master coefficients via various physical...

23. Efficient NLO computation for gg->HH/ZH with top quark mass dependence

Dr Guo-Xing Wang

30/10/2020, 05:00

Recently, we present a precise and efficient computation of the two-loop amplitudes entering gg->HH/ZH and present for the first time a calculation of the complete NLO corrections to the gg->ZH process. We use the method of small mass expansion to tackle the most challenging two-loop virtual amplitude, in which the top quark mass dependence is retained throughout the calculations. Our results...

24. Compton Scattering at Next-to-leading Order

Xiaoyuan Zhang

30/10/2020, 06:00

The analytic form for the total QED scattering cross section of an electron and a photon at order \alpha^3 is computed. This includes both the double-Compton scattering real-emission contribution as well as the virtual Compton scattering part. When combined with the recent analytic result for the pair-production cross section, the complete \alpha^3 cross section is now known. Both the...