Development of ATLAS ITk tracking software & applicability of improved tracking to searches for long-lived supersymmetric particles in Run 3&4 at LHC

ATLAS跟踪器ITk的航迹重建是其关键。在他们的博士学位期间，学生将详细研究ITk的性能，与利物浦和DESY的专家一起开发跟踪软件。作为评估ITk跟踪性能和优化跟踪软件的基准，学生将专注于寻找超对称模型中预测的暗物质候选者，其中电弱超对称粒子之间的质量分裂低于1 GeV。由于LHC的灵敏度非常有限，这些情景将成为HL-LHC研究的“热门话题”之一。在这些情况下，带电的最轻的超对称粒子在最里面的跟踪探测器内衰减，产生消失的轨道签名。对跟踪性能的深入了解至关重要，学生将最有能力为预计将于2022-2023年完成的真实的数据的运行3分析做出贡献。学生将成为ATLAS跟踪软件团队的核心成员，专注于ITk软件。他们将能够直接将这种理解与新探测器的物理前景联系起来。

The track reconstruction in the upgraded ATLAS tracker, the ITk, is crucial. During their PhD, the student is expected to study in detail the performance of the ITk, working on the tracking software together with experts at Liverpool and DESY. As benchmark to evaluate the tracking performance of the ITk and optimise the tracking software, the student will focus on the search for dark matter candidates as predicted in supersymmetric models where the mass splitting between electroweak supersymmetric particles is below 1 GeV. These scenarios will be one of the "hot topics" of the HL-LHC studies as there is very limited sensitivity at the LHC. In these scenarios the charged lightest SUSY particle decays within the innermost tracking detector gives rise to a disappearing track signature. An in-depth understanding of the tracking performance is crucial and the student will be best placed to also contribute to the Run 3 analysis on real data expected to be completed by 2022-2023. The student will be a core member of the ATLAS tracking software team, focusing on the ITk software. They will be able to link directly this understanding to the physics prospects of a new detector.