论文标题
Run-2中Atlas内部检测器的对齐
Alignment of the ATLAS Inner Detector in Run-2
论文作者
论文摘要
已经使用$ \ sqrt {s} = 13 $ tev在运行2（LHC）的大型Hadron Collider（LHC）的运行2（2015年至2018年）期间，使用$ \ sqrt {s} = 13 $ tev研究了地图集内探测器对准的性能。检测器比对的目的是尽可能准确地确定检测器几何形状，并纠正时间依赖时间的运动。内部检测器比对基于从整体机械组装结构到局部传感器的一系列层次级别的轨道残差最小化。随后的水平具有越来越多的自由度。总共有几乎750000。对齐方式决定了探测器几何形状在短时间和长时间标准上，短时间尺度描述了LHC填充内的运动。评估源自系统检测器变形的性能和可能的轨道参数偏差。使用衰减对兆或电子的谐振研究动量偏见。对齐后的残留sagitta偏差和动量比例分别减少到$ \ sim $ 0.1 tev $^{ - 1} $和0.9 $ \ times10^{ - 3} $。还使用喷气机中的轨道评估了影响参数偏差。
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.
