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arXiv 1810.04450hep-ex
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在${E_{\textrm {beam}}}$ = 4 TeV的ATLAS实验中模拟和观测到的TeV光束背景之间的比较

Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at ${E_{\textrm {beam}}}$ = 4 TeV

ATLAS Collaboration

摘要:

介绍了大型强子对撞机(LHC)ATLAS实验中束流诱导背景(BIB)的专用蒙特卡罗模拟结果,并与2012年记录的数据进行了比较。在正常的物理操作过程中,该背景主要来自于束管中的残余气体上的4TeV质子的散射。描述了在基于FLUKA蒙特卡罗模拟包的模拟链中开发和实现的ATLAS探测器中重建BIB信号的方法。相互作用速率由LHC环中的剩余气体压力分布确定,以便在BIB的预测速率上设置绝对尺度,从而可以与数据进行定量比较。通过这些比较,BIB的起源导致不同的ATLAS探测器的可观测性进行了分析。2012年ATLAS的模拟结果和BIB测量结果之间的一致性水平表明,对BIB的起源已经有了很好的理解。

英文摘要:

Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the FLUKA Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared quantitatively with data. Through these comparisons the origins of the BIB leading to different observables in the ATLAS detectors are analysed. The level of agreement between simulation results and BIB measurements by ATLAS in 2012 demonstrates that a good understanding of the origin of BIB has been reached.

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