Search for new physics on the FASER experiment at the LHC

在 LHC 的 FASER 实验中寻找新物理学

• 批准号: 2907451
• 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: 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-2907451
• 关键词: Search; new; physics; FASER; experiment

The Forward Search Experiment (FASER) is a ground-breaking CERN-based initiative that commenced data-taking during the Summer of 2022 as part of Run 3 of the Large Hadron Collider (LHC). Positioned 480 meters downstream of the proton-proton interaction point used by the ATLAS experiment, FASER is specifically designed for the exploration of light and weakly-interacting Beyond Standard Model (BSM) particles characterized by a substantial lifetime, known as Long-Lived Particles (LLPs). FASER's instrumental configuration comprises a cylindrical spectrometer equipped with a tracker and calorimeter, submerged in a 0.6 Tesla magnetic field. This novel experiment has already accumulated approximately 40/fb of data and is anticipated to amass more than 200/fb by the end of Run 3 in 2025.The primary focus of this research is to analyse the data obtained by FASER, concentrating on the quest for Long-Lived Dark Photons. These particles exhibit a distinctive signature characterised by two oppositely charged, high-energy tracks, originating from a common vertex within the detector. These tracks possess a combined momentum pointing back through 10 meters of concrete and 90 meters of rock to the ATLAS interaction point. Initial data analysis utilizing basic techniques will have already been conducted, with preliminary results made available. The project will involve enhancing these preliminary analyses to increase the sensitivity to dark photons and to explore other novel physics models, including axion-like particles.Advanced multivariate techniques, such as neural networks, will be employed to develop sophisticated analyses aimed at optimizing signal selection and background reduction. This includes the integration of information from individual detector components to establish a comprehensive particle identification framework, significantly enhancing the separation of signal and background events.Furthermore, feasibility studies will be conducted for a proposed FASER experiment upgrade, which involves the installation of an entirely new detector in a state-of-the-art facility. This upgraded FASER experiment will collect a substantially larger dataset at the High-Luminosity LHC, opening new avenues for ground-breaking discoveries in the realm of particle physics.

远期搜索实验（FASER）是一项基于开创性的CERN计划，在2022年夏季开始研究，这是大型强子对撞机（LHC）的Run 3的一部分。 FASER专门设计了ATLAS实验使用的质子 - 蛋白质相互作用点的480米，专门设计用于探索光线和弱相互交互的标准模型（BSM）颗粒，这些模型（BSM）颗粒具有实质性寿命，称为长寿命颗粒（LLP）。 FASER的仪器配置包括配备跟踪器和量热计的圆柱光谱仪，并浸入0.6 Tesla磁场中。这个新型实验已经积累了大约40/fb的数据，预计到2025年运行3结束时会积聚200/fb。这项研究的主要重点是分析Faser获得的数据，集中于寻求悠久的深色光子。这些颗粒表现出独特的特征，其特征是两个相对带的高能轨道，源自检测器内的一个普通顶点。这些轨道具有一个组合的动量，可以回到10米的混凝土和90米的岩石到地图集的相互作用点。使用基本技术的初始数据分析将已经进行，并提供了初步结果。该项目将涉及增强这些初步分析，以提高对暗光子的敏感性，并探索其他新型物理模型，包括轴突样颗粒。高级多元技术（例如神经网络）将采用最佳的旨在开发旨在实现信号选择和背景选择的精致分析。这包括整合来自单个检测器组件的信息，以建立一个全面的粒子识别框架，从而显着增强了信号和背景事件的分离。Furthermore将对拟议的FASER实验升级进行可行性研究，这涉及在较为省剂的设施中安装全新的检测器。这项升级的FASER实验将在高亮度LHC上收集一个更大的数据集，为在粒子物理领域中开创性发现的新途径。