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

ATLAS ITk追踪软件开发

• 批准号: 2275702
• 金额: --
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275702
• 关键词: Development; ATLAS; ITk; tracking; software

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.

在升级后的ATLAS跟踪器ITK中，航迹重建至关重要。在攻读博士学位期间，这名学生将与利物浦和DESY的专家一起详细研究ITK的表现，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，学生将专注于搜索在超对称模型中预测的候选暗物质，在超对称模型中，电弱超对称粒子之间的质量分裂低于1GeV。由于大型强子对撞机的敏感性非常有限，这些情景将成为大型强子对撞机研究的“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变，导致轨迹签名消失。对跟踪性能的深入了解至关重要，学生将处于最佳地位，也将为预计在2022-2023年前完成的对实际数据的第三轮分析做出贡献。该学生将成为ATLAS跟踪软件团队的核心成员，专注于ITK软件。他们将能够将这种理解与新探测器的物理前景直接联系起来。

项目成果

Search for long-lived charginos based on a disappearing-track signature using 136 fb$$^{-1}$$ of pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector

使用 ATLAS 探测器在 $$sqrt{s}$$ = 13 TeV 处使用 136 fb$$^{-1}$$ pp 碰撞，基于消失轨道签名搜索长寿命的电荷

• DOI: 10.1140/epjc/s10052-022-10489-5
• 发表时间: 2022
• 期刊: The European Physical Journal C
• 作者: Aad G