Standard Model measurements and QCD fits using ATLAS data at the LHC

使用 LHC 上的 ATLAS 数据进行标准模型测量和 QCD 拟合

• 批准号: 2880996
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2880996
• 关键词: Standard; Model; measurements; QCD; fits

Context:Precision Standard Model (SM) measurements will be performed with the ATLAS experiment, using Run 2 and Run 3 data from the Large Hadron Collider (LHC) at CERN. The focus will be on measurements sensitive to the parton distribution functions (PDFs) of the proton, in particular those involving jets. Such measurements are also important to improve QCD modelling. The student will be actively involved in the ATLAS PDF forum, and will be a key player in new PDF determinations using LHC data, including the student's own measurements. A first ATLAS SM effective field theory (EFT) analysis, which simultaneously extracts PDFs and EFT parameters, is also expected. In addition, the student will spend some proportion of their time extending the state-of-the-art tools required for PDF determinations, in the context of the APPLfast project, which provides the technology to include new LHC cross section data in PDF determinations, and is used by all global PDF fitters world-wide. A small portion of time will also be spent working in the inclusive working group for the EPIC experiment at the EIC, studying the detector requirements for inclusive measurements.Aims and objectives: Contribute to the operation of the ATLAS detector via shifts, and authorship qualification tasks within the JetEtmiss and/or PMG group, aiming to improve pileup mitigation techniques and/or modelling. Perform analysis using the Run 2 and 3 ATLAS datasets, and investigate the impact of those measurements, and others, on constraining proton PDFs. Contribute to state-of-the-art tools, used world-wide for proton PDF determination. Publish results.Novelty of research and methodology:Measurements will be using the most precise available datasets. We expect new analysis techniques to be developed, leading also to improved systematics. New Monte Carlo simulations, and state-of-the-art calculations will be used (including in the extraction of proton PDFs). Definition of new observables, never before measured, aimed at optimising sensitivity to QCD modelling, thus providing invaluable information for improved MC simulations and more precise determinations of backgrounds to new physics searches. Development of state-of-the-art software tools for proton PDF determination which will be used world-wide. We also expect the first ATLAS standard model effective field theory analysis simultaneously extracting PDFs and EFT parameters.

精密标准模型（SM）测量将与ATLAS实验一起进行，使用来自CERN大型强子对撞机（LHC）的运行2和运行3数据。重点将放在测量敏感的部分子分布函数（PDF）的质子，特别是那些涉及射流。这种测量对于改进QCD模型也很重要。学生将积极参与ATLAS PDF论坛，并将成为使用LHC数据（包括学生自己的测量）确定新PDF的关键参与者。第一ATLAS SM有效场理论（EFT）分析，同时提取PDF和EFT参数，也是预期的。此外，学生将花费一定比例的时间扩展PDF测定所需的最先进的工具，在APPLfast项目的背景下，该项目提供了将新的LHC横截面数据纳入PDF测定的技术，并被全球所有PDF拟合者使用。一小部分时间也将花在包容性工作组的EPIC实验在EIC的工作，研究包容性测量的探测器要求。目的和目标：通过转移，并在JetEtmiss和/或PMG组内的作者资格认证任务，有助于ATLAS探测器的操作，旨在改善堆积缓解技术和/或建模。使用运行2和3 ATLAS数据集进行分析，并研究这些测量和其他测量对约束质子PDF的影响。为世界范围内用于质子PDF测定的最先进的工具做出贡献。研究和方法的新奇：测量将使用最精确的现有数据集。我们期望开发新的分析技术，从而改进系统学。将使用新的蒙特卡罗模拟和最先进的计算（包括质子PDF的提取）。新的观测量的定义，从来没有测量，旨在优化灵敏度QCD建模，从而提供宝贵的信息，改进MC模拟和更精确的测定背景新的物理搜索。开发最先进的质子PDF测定软件工具，将在全球范围内使用。我们也期待第一个ATLAS标准模型有效场论分析同时提取PDF和EFT参数。