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arXiv 2007.07624hep-ex
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运行2中ATLAS内部探测器的对准

Alignment of the ATLAS Inner Detector in Run-2

ATLAS Collaboration

备注：
61 pages in total, author list starting page 45, 26 figures, 4 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/IDTR-2019-05
发表信息：
Eur. Phys. J. C 80 (2020) 1194
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arXiv 页面 ↗HTML 原文 ↗

摘要：

ATLAS内部探测器对准的性能已经使用大型强子对撞机（LHC）运行2（2015年至2018年）期间ATLAS实验收集的$\sqrt{s} = 13$ TeV的$pp$碰撞数据进行了研究。探测器对准的目标是尽可能准确地确定探测器几何形状，并校正随时间变化的运动。内部检测器对齐基于从全局机械装配结构到局部传感器的一系列分层级别中的轨道命中残差的最小化。随后的层次有越来越多的自由度;总共有近750000。对准决定了探测器在短时间尺度和长时间尺度上的几何形状，其中短时间尺度描述了LHC填充内的运动。的性能和可能的轨道参数偏差源于系统的检测器变形进行了评估。动量偏置是利用衰变为μ子或电子的共振来研究的。校准后的剩余矢偏和动量标度偏分别减小到小于0.1 TeV $^{-1}$和0.9 $\times10^{-3}$。碰撞参量偏差也使用喷流内的轨迹进行评估。

英文摘要：

The performance of the ATLAS Inner Detector alignment has been studied using $pp$ collision data at $\sqrt{s} = 13$ TeV collected by the ATLAS experiment during Run 2 (2015 to 2018) of the Large Hadron Collider (LHC). The goal of the detector alignment is to determine the detector geometry as accurately as possible and correct for time-dependent movements. The Inner Detector alignment is based on the minimization of track-hit residuals in a sequence of hierarchical levels, from global mechanical assembly structures to local sensors. Subsequent levels have increasing numbers of degrees of freedom; in total there are almost 750000. The alignment determines detector geometry on both short and long timescales, where short timescales describe movements within an LHC fill. The performance and possible track parameter biases originating from systematic detector deformations are evaluated. Momentum biases are studied using resonances decaying to muons or to electrons. The residual sagitta bias and momentum scale bias after alignment are reduced to less than $\sim$0.1 TeV$^{-1}$ and 0.9$\times10^{-3}$, respectively. Impact parameter biases are also evaluated using tracks within jets.

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