We present the MadAnalysis 5 implementation and validation of the ATLAS-SUSY-2018-04 search. This ATLAS analysis targets direct stau production in events with two hadronic tau leptons, and probes 139 fb[Formula: see text] of LHC proton–proton collisions at a center-of-mass energy of 13 TeV. The validation of our re-implementation relies on a comparison of our cutflow predictions with the auxiliary material and official results provided by the ATLAS collaboration in the context of two supersymmetry-inspired simplified benchmark models in which the Standard Model is extended by a neutralino and a stau decaying into a tau lepton and a neutralino. A first scenario focuses on very light staus, whereas a second one addresses heavier staus. Our predictions have been found to agree with ATLAS official cutflows at the level of 6–8% in the heavy stau scenario, and exhibit a larger discrepancy (of 15–50%) in the light stau scenario. This disagreement is however considered as not too significant, as both ATLAS and MadAnalysis 5 predictions come with large Monte Carlo numerical uncertainties.

中文翻译：

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在 MadAnalysis 5 框架中执行 ATLAS-SUSY-2018-04 分析（di-tau 中的状态加上缺少的横向能量通道；139 fb-1）

我们介绍了 ATLAS-SUSY-2018-04 搜索的 MadAnalysis 5 实施和验证。该 ATLAS 分析针对具有两个强子 tau 轻子的事件中的直接 stau 产生，并在 13 TeV 的质心能量下探测 LHC 质子-质子碰撞的 139 fb[公式：见文本]。我们重新实施的验证依赖于在两个超对称启发的简化基准模型的背景下，将我们的割流预测与辅助材料和 ATLAS 合作提供的官方结果进行比较，其中标准模型由中性点和stau 衰变成一个 tau 轻子和一个中性子。第一个场景关注非常轻的状态，而第二个场景关注更重的状态。我们的预测在重 stau 情景中与 ATLAS 官方削减 6-8% 的水平一致，在轻 stau 情景中表现出更大的差异（15-50%）。然而，这种分歧被认为不太重要，因为 ATLAS 和 MadAnalysis 5 的预测都带有很大的蒙特卡洛数值不确定性。