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Use of charged-track information to subtract neutral pileup

机译：使用带电轨道信息减去中性堆积

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The use of charged pileup tracks in a jet to predict the neutral pileup component in that same jet could potentially lead to improved pileup removal techniques, provided there is a strong local correlation between charged and neutral pileup. In a Monte?Carlo simulation we find that the correlation is however moderate, a feature that we attribute to characteristics of the underlying nonperturbative dynamics. Consequently, pure “neutral-proportional-to-charge” (NpC) pileup mitigation approaches do not outperform existing, area-based pileup removal methods. This finding contrasts with the arguments made in favor of a new method, “jet cleansing,” in part based on the NpC approach. We identify the critical differences between the performances of linear cleansing and trimmed NpC as being due to the former’s rejection of subjets that have no charged tracks from the leading vertex, a procedure that we name “zeroing.” Zeroing, an extreme version of the “charged-track trimming” proposed by ATLAS, can be combined with a range of pileup mitigation methods, and appears to have both benefits and drawbacks. We show how the latter can be straightforwardly alleviated. We also discuss the limited potential for improvement that can be obtained by linear combinations of the NpC and area-subtraction methods.
机译：如果在带电的中性堆积与中性的堆积之间存在很强的局部相关性，则在喷射器中使用带电的堆积轨迹来预测同一喷射器中的中性堆积成分可能会导致改进的堆积去除技术。在蒙特卡洛模拟中，我们发现相关性是中等的，我们将其归因于基本非扰动动力学的特征。因此，纯粹的“中性收费比例”（NpC）缓解方法不会胜过现有的基于区域的堆积消除方法。这一发现与部分基于NpC方法的支持“喷射清洗”新方法的论点形成了鲜明对比。我们发现线性清洗与修剪NpC的性能之间存在关键差异，这是由于前者拒绝了从前顶点没有带电走线的子喷气机，我们将此过程称为“调零”。归零是ATLAS提出的“带电轨道微调”的一种极端形式，可以与一系列缓解堆积的方法结合使用，并且既有优点也有缺点。我们展示了如何可以直接缓解后者。我们还讨论了通过NpC和面积相减方法的线性组合可以获得的有限的改进潜力。

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