Quark Contraction Tool - QCT

We present a Mathematica package for the calculation of Wick contractions in quantum field theories — QCT. The package aims at automatically generating code for the calculation of physical matrix elements, suitable for numerical evaluation in a C++ program. To that end commonly used algebraic manipulations for the calculation of matrix elements in lattice QCD are implemented.我们提出了一款用于量子场论中维克收缩（Wick contractions）计算的Mathematica软件包——QCT。该软件包旨在自动生成物理矩阵元的计算代码，可适配C++程序中的数值求值。为此，我们实现了格点量子色动力学（lattice QCD）中矩阵元计算所需的常用代数操作方法。