We present the implementation, in the MadAnalysis 5 framework, of the ATLAS-SUSY-2018-31 search for new physics, and document the validation of this implementation. This analysis targets, with 139 fb[Formula: see text] of proton–proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector between 2015 and 2018, the production of a pair of supersymmetric bottom squarks when they further decay through a cascade decay involving the second lightest neutralino and a Standard Model Higgs boson. The validation of our work is based on three benchmark scenarios targeting different kinematic configurations. The first of them considers a new physics spectrum leading to the presence of high-[Formula: see text] [Formula: see text]-jets originating from sbottom decays, whereas the last two, that differ by the neutralino mass spectrum, are dedicated to the compressed regime and thus yield the presence of soft [Formula: see text]-jets in the final state. We obtain an agreement between the MadAnalysis 5 predictions and the official ATLAS results at the level of 20–30%, the largest discrepancies being related to cases exhibiting a poor Monte Carlo numerical precision at the level of the official ATLAS results.

中文翻译：

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在 MadAnalysis 5 框架中执行 ATLAS-SUSY-2018-31 分析（具有多底部和缺少横向能量的底部；139 fb-1）

我们在 MadAnalysis 5 框架中展示了 ATLAS-SUSY-2018-31 搜索新物理的实现，并记录了该实现的验证。该分析的目标是，ATLAS 探测器在 2015 年至 2018 年期间记录的质心能量为 13 TeV 的质子-质子碰撞 139 fb[公式：见正文]，当它们通过涉及第二轻的中性子和标准模型希格斯玻色子的级联衰变进一步衰变。我们工作的验证基于针对不同运动学配置的三个基准场景。他们中的第一个考虑了一个新的物理光谱，导致存在源自底部衰变的高-[公式：见文本] [公式：见文本]-射流，而后两个，由于中性子质谱不同，专用于压缩状态，因此在最终状态下产生软 [公式：见文本]-喷气机。我们在 20-30% 的水平上获得了 MadAnalysis 5 预测和官方 ATLAS 结果之间的一致性，最大的差异与在官方 ATLAS 结果水平上表现出较差的蒙特卡罗数值精度的案例有关。