MARTY，一个新的C++框架，用于超越标准模型物理中的自动符号计算
MARTY, a new C++ framework for automated symbolic calculations in Beyond the Standard Model physics
摘要：
超越标准模型（BSM）的理论计算对高能物理学家来说是一个挑战，但在寻找新物理时是必要的。BSM方案的预测需要与实验数据和标准模型值进行比较，以确定更适合我们在粒子对撞机中观察到的模型。BSM预测需要非常复杂和容易出错的振幅，横截面和威尔逊系数的计算。在单回路水平上的计算通常是必要的，因为一些现象学上重要的过程可能不会发生在树水平上，如风味物理中的风味变化中性电流（FCNC）在树水平上消失。单回路计算必须通过分析完成，这非常耗时，并且在实践中很少对一般BSM模型进行。在这里，我们介绍了MARTY，一个公共和开源的C++代码。MARTY是第一个能够自动计算一般BSM模型单圈水平振幅、振幅平方和Wilson系数的独立程序。这种类型的计算需要计算机代数系统，并且到目前为止只能使用Mathematica来完成，Mathematica是一种用于符号操作的商业和封闭软件。MARTY不依赖Mathematica，因为它也用C++重新实现了自己的计算机代数系统，称为CSL。MARTY将大大简化BSM研究，因为通过自动化分析计算，用户的主要任务将是模型构建部分。一旦与粒子物理学中的其他唯象代码接口，MARTY将非常有效地自动对一般BSM模型进行详细的预测。
英文摘要：
Theoretical calculations Beyond the Standard Model (BSM) constitute a challenge for high energy physicists, but are necessary when searching for New Physics. The predictions of a BSM scenario need to be compared with experimental data and the Standard Model values in order to identify the model that fits better what we observe in particle colliders. BSM predictions require very involved and error prone calculations of amplitudes, cross-sections and Wilson coefficients. Calculations at the one-loop level are often necessary for these quantities since some phenomenologically important processes may not occur at tree-level, such as Flavor Changing Neutral Currents (FCNC) in flavor physics that vanish at the tree-level. One-loop calculations have to be done analytically which is very time consuming and in practice rarely done for general BSM models. Here we present MARTY, a public and open-source C++ code. MARTY is the very first independent program able to calculate automatically amplitudes, squared amplitudes and Wilson coefficients at the one-loop level for general BSM models. This type of calculations requires a computer algebra system and could only be done, up to now, using Mathematica, a commercial and closed software for symbolic manipulations. MARTY does not rely on Mathematica since it re-implements its own computer algebra system also in C++, called CSL. MARTY will considerably ease BSM studies as by automating the analytical calculations the main task of the user would be the model building part. Once interfaced with other phenomenological codes in particle physics, MARTY will be incredibly efficient to make detailed predictions for general BSM models automatically.
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