A High-Granularity Timing Detector in ATLAS: Performance at the HL-LHC
A High-Granularity Timing Detector in ATLAS: Performance at the HL-LHC
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DOI：
10.1016/j.nima.2018.05.028
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发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
C. Allaire
中科院分区：
文献类型：
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作者：
C. Allaire
碰撞的大幅增加是HL-LHC物理计划面临的主要实验挑战之一。解决这一挑战的一个强有力的新方法是利用相互作用的时间扩展来区分在空间上非常接近但在时间上完全分开的碰撞。针对ATLAS二期升级，提出了一种基于低增益雪崩探测器技术的高粒度定时探测器。该器件覆盖了2.4到4.0的伪快度区域，对最小电离粒子的定时分辨率为30ps，将显著提高前进区的性能。高精度计时极大地改善了轨迹到顶点的关联，导致在重建喷流和轻子以及标记重味道喷流方面的性能类似于中心区域。物体重建性能的这些改进转化为重要的灵敏度收益，并增强了HL-LHC物理计划的覆盖范围。此外，高粒度计时探测器还提供独特的在线和离线光度测定功能。
The large increase of pileup is one of the main experimental challenges for the HL-LHC physics program. A powerful new way to address this challenge is to exploit the time spread of the interactions to distinguish between collisions occurring very close in space but well separated in time. A High-Granularity Timing Detector, based on low gain avalanche detector technology, is proposed for the ATLAS Phase-II upgrade. Covering the pseudorapidity region between 2.4 and 4.0, with a timing resolution of 30 ps for minimum-ionizing particles, this device will significantly improve the performance in the forward region. High-precision timing greatly improves the track-to-vertex association, leading to a performance similar to that in the central region for the reconstruction of both jets and leptons, as well as for the tagging of heavy-flavor jets. These improvements in object reconstruction performance translate into important sensitivity gains and enhance the reach of the HL-LHC physics program. In addition, the High-Granularity Timing Detector offers unique capabilities for the online and offline luminosity determination.