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arXiv 1609.09324hep-ex
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在ATLAS探测器中重建$\sqrt{s}=$ 8 TeV质子-质子碰撞中丢失横动量的算法性能

Performance of algorithms that reconstruct missing transverse momentum in $\sqrt{s}=$ 8 TeV proton-proton collisions in the ATLAS detector

ATLAS Collaboration

备注：
69 pages in total, author list starting page 53, 26 figures, 6 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2014-04/
发表信息：
Eur. Phys. J. C77 (2017) 241
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摘要：

重建和校准算法用于计算丢失的横向动量（$E_{\rm T}^{\rm miss}$）与ATLAS探测器利用能量沉积在量热计和轨道重建的内部检测器以及μ子光谱仪。各种策略被用来抑制额外的质子-质子相互作用，称为堆积，并发硬散射过程所产生的影响。跟踪信息被用来区分从堆积相互作用的贡献，使用它们的顶点分离沿光束轴。$E_{\rm T}^{\rm miss}$重建算法的性能，特别是相对于堆积的量，使用收集的数据在质子-质子碰撞在8 TeV的质心能量在2012年期间进行评估，并显示结果的数据样本对应于20.3 fb的积分亮度光度$^{-1}$。模拟建模的$E_{\rm T}^{\rm miss}$的事件中包含一个$Z$玻色子衰变到两个带电轻子（电子或μ子）或一个$W$玻色子衰变到一个带电轻子和中微子的结果进行比较的数据。接受不同的事件拓扑结构，有和没有高横向动量中微子，示出了一系列的阈值标准$E_{\rm T}^{\rm miss}$，并估计系统的不确定性在$E_{\rm T}^{\rm miss}$测量。

英文摘要：

The reconstruction and calibration algorithms used to calculate missing transverse momentum ($E_{\rm T}^{\rm miss}$) with the ATLAS detector exploit energy deposits in the calorimeter and tracks reconstructed in the inner detector as well as the muon spectrometer. Various strategies are used to suppress effects arising from additional proton-proton interactions, called pileup, concurrent with the hard-scatter processes. Tracking information is used to distinguish contributions from the pileup interactions using their vertex separation along the beam axis. The performance of the $E_{\rm T}^{\rm miss}$ reconstruction algorithms, especially with respect to the amount of pileup, is evaluated using data collected in proton-proton collisions at a centre-of-mass energy of 8 TeV during 2012, and results are shown for a data sample corresponding to an integrated luminosity of 20.3 fb$^{-1}$. The results of simulation modelling of $E_{\rm T}^{\rm miss}$ in events containing a $Z$ boson decaying to two charged leptons (electrons or muons) or a $W$ boson decaying to a charged lepton and a neutrino is compared to data. The acceptance for different event topologies, with and without high transverse momentum neutrinos, is shown for a range of threshold criteria for $E_{\rm T}^{\rm miss}$, and estimates of the systematic uncertainties in the $E_{\rm T}^{\rm miss}$ measurements are presented.

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