CWebGen -- A tool to study colour structure of scattering amplitudes in IR limit

Infrared singularities in perturbative Quantum Chromodynamics (QCD) are captured by the Soft function, which can be calculated efficiently in terms of multiparton webs. Web is a closed set of diagrams whose colour and kinematics mix through a web mixing matrix. The web mixing matrices are computed using a well known replica trick algorithm. We present a package implemented in Mathematica to calculate these mixing matrices. Along with the package, we provide benchmark points for several state-of-the art computations.微扰量子色动力学（QCD）中的红外奇点可由软函数（Soft function）描述，而软函数可借助多部分子网（multiparton webs）实现高效计算。多部分子网是一类闭合费曼图集合，其色自由度与运动学自由度可通过网混合矩阵（web mixing matrix）实现混合。网混合矩阵可通过经典的复本技巧算法（replica trick algorithm）完成计算。本文提出了一款基于Mathematica实现的、用于计算此类混合矩阵的工具包。随该工具包一同提供的，还有针对多项当前顶尖计算的基准测试点集。