Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
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DOI：
10.1088/1748-0221/8/07/p07004
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发表时间：
2013-07-01
影响因子：
1.3
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
--
作者：
Aad, G.;Abajyan, T.;Zwalinski, L.
本文总结了 ATLAS 探测器中观察到的光束诱导背景，并讨论了标记和去除数据中背景污染事件的方法。提出了基于触发率的光束相关背景监测。讨论了背景与机器条件（例如束管中的残余压力）的相关性。显示了专用光束背景模拟的结果，并评估了它们与数据的定性一致性。在未配对（即非碰撞）质子束通过期间获取的数据用于获取背景丰富的数据样本。这些用于识别光束引起的背景的特征，然后利用这些特征来开发专用的背景标记工具。这些工具基于像素探测器、μ子光谱仪和量热仪中的可观测值，详细描述并评估了它们的效率。最后给出了将这些技术应用于单射流分析的示例，这证明了此类事件清理技术对于一些新的物理搜索的重要性。
This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag and remove background contaminated events in data. Trigger-rate based monitoring of beam-related backgrounds is presented. The correlations of backgrounds with machine conditions, such as residual pressure in the beam-pipe, are discussed. Results from dedicated beam-background simulations are shown, and their qualitative agreement with data is evaluated. Data taken during the passage of unpaired, i.e. non-colliding, proton bunches is used to obtain background-enriched data samples. These are used to identify characteristic features of beam-induced backgrounds, which then are exploited to develop dedicated background tagging tools. These tools, based on observables in the Pixel detector, the muon spectrometer and the calorimeters, are described in detail and their efficiencies are evaluated. Finally an example of an application of these techniques to a monojet analysis is given, which demonstrates the importance of such event cleaning techniques for some new physics searches.