Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at E beam =4 TeV
Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at E beam =4 TeV
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E 束 =4 TeV 下 ATLAS 实验中模拟和观测到的 LHC 束背景比较
DOI：
10.1088/1748-0221/13/12/p12006
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发表时间：
2018
影响因子：
1.3
通讯作者：
Aaboud M
中科院分区：
文献类型：
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作者：
Aaboud M
ATLAS实验[1]上游1的大型强子对撞机（LHC）环中的质子损失，由于与束流管中的残余气体（束流-气体散射）或与准直器等机器元件的相互作用，导致束流诱导背景（BIB）。尽管与每秒近109个质子-质子（pp）碰撞产生的粒子碎片相比，这种速率可以忽略不计，但BIB有一些特殊的特征，使其具有潜在的问题：它的特征是粒子几乎平行于束流线，这可以在基于硅像素技术的最内层跟踪探测器中产生具有大能量沉积的细长簇。在高速率下，这些异常大的集群可能会影响数据获取效率。此外，物理分析的潜在背景来自高能μ子，主要来自束流损失引起的强子阵雨中的介子和介子衰变。这些介子可以通过辐射过程在量热计中储存大量能量。这种能量沉积与相互作用点（IP）的硬散射无关，可以被重建为导致的假射流
Proton losses in the Large Hadron Collider (LHC) ring upstream 1 of the ATLAS experiment [1], due to interactions with either residual gas in the beam pipe (beam-gas scattering) or with machine elements such as collimators, result in beam-induced background (BIB). Although the rates are negligible compared to particle debris from almost 109 proton-proton (pp) collisions per second, BIB has particular features that render it potentially problematic: it is characterised by particles almost parallel to the beam line, which can produce elongated clusters with large energy deposition in the innermost tracking detectors based on silicon pixel technology. At high rates, these abnormally large clusters can affect data-taking efficiency [2]. Furthermore, a potential background for physics analyses arises from high-energy muons, originating mostly from pion and kaon decay in the hadronic showers induced by beam losses. These muons can deposit large amounts of energy in calorimeters through radiative processes. Such energy depositions, which are not associated with a hard scattering at the interaction point (IP), can be reconstructed as fake jets leading to