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

背景：精密标准模型(SM)测量将通过ATLAS实验进行，使用来自欧洲核子研究中心大型强子对撞机(LHC)的RUN 2和Run 3数据。重点将放在对质子的部分子分布函数(PDF)敏感的测量上，特别是那些涉及喷流的测量。这样的测量对于改进QCD模型也很重要。学生将积极参与ATLAS PDF论坛，并将成为使用大型强子对撞机数据(包括学生自己的测量)进行新的PDF确定的关键参与者。还预计将出现第一个ATLAS SM有效场论(EFT)分析，它同时提取PDF和EFT参数。此外，学生将在APPLfast项目的背景下，花费一定比例的时间来扩展PDF测定所需的最先进的工具，该项目提供了在PDF测定中包括新的LHC横截面数据的技术，并被世界各地的所有全球PDF Fiters使用。还将花费一小部分时间在EIC的EPIC实验的包容性工作组中工作，研究包容性测量的探测器要求。目的和目标：通过轮班和JetEtMissing和/或PMG小组内的作者资格鉴定任务，促进ATLAS探测器的操作，旨在改进缓解堆积的技术和/或建模。使用Run 2和Run 3 ATLAS数据集执行分析，并调查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。发布结果。研究和方法的新奇之处：测量将使用最精确的可用数据集。我们期待新的分析技术被开发出来，这也导致了系统学的改进。将使用新的蒙特卡罗模拟和最先进的计算(包括在提取质子PDF时)。对以前从未测量过的新观测值的定义，旨在优化QCD建模的敏感性，从而为改进MC模拟和为新的物理搜索更精确地确定背景提供宝贵的信息。开发最先进的质子PDF测定软件工具，将在世界范围内使用。我们还期待着第一个ATLAS标准模型的有效场论分析，同时提取PDF和EFT参数。

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.