论文标题
改进MADGRAPH5_AMC@nlo中的颜色计算并探索1/NC扩展
Improving Colour Computations in MadGraph5_aMC@NLO and Exploring a 1/Nc Expansion
论文作者
论文摘要
在本文中，我们提出了MadGraph5_AMC@nlo的扩展，该扩展能够评估树级QCD矩阵元素最高$ 2 \至6 $（比以前多于一个粒子）。为了实现这一目标，我们实施了类似-giele的递归，并重新实现了颜色的计算方式，以使我们现在可以以1/NC的功率扩展颜色矩阵，并将此扩展截断为所选顺序。对于高多种样本，即使在不截断颜色矩阵的情况下，与以前的MADGRAPH5_AMC@NLO代码相比，新实现也提供了速度增长。
In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to $2\to 6$ (one more particle than before). To achieve this, we implemented Berends-Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1/Nc and truncate this expansion to a chosen order. For high multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.
