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.

前向搜索实验 (FASER) 是一项基于 CERN 的突破性计划，作为大型强子对撞机 (LHC) 第 3 次运行的一部分，于 2022 年夏季开始收集数据。 FASER 位于 ATLAS 实验使用的质子-质子相互作用点下游 480 米处，专为探索超标准模型 (BSM) 轻弱相互作用粒子而设计，其特点是寿命较长，称为长寿命粒子 (有限责任合伙企业）。 FASER 的仪器配置包括配备跟踪器和热量计的圆柱形光谱仪，浸没在 0.6 特斯拉的磁场中。这项新颖的实验已经积累了大约 40/fb 的数据，预计到 2025 年第 3 轮运行结束时将积累超过 200/fb。这项研究的主要重点是分析 FASER 获得的数据，重点关注探索对于长寿命的暗光子。这些粒子表现出独特的特征，其特征是两个带相反电荷的高能轨道，源自探测器内的一个共同顶点。这些轨道具有综合动量，可穿过 10 米混凝土和 90 米岩石到达 ATLAS 交互点。利用基本技术进行的初步数据分析已经完成，并已提供初步结果。该项目将涉及加强这些初步分析，以提高对暗光子的敏感性，并探索其他新颖的物理模型，包括类轴子粒子。先进的多元技术，如神经网络，将用于开发旨在优化信号选择的复杂分析和背景减少。这包括整合来自各个探测器组件的信息，以建立全面的粒子识别框架，显着增强信号和背景事件的分离。此外，还将针对拟议的 FASER 实验升级进行可行性研究，其中涉及安装全新的探测器位于最先进的设施中。这项升级后的 FASER 实验将在高光度大型强子对撞机上收集更大的数据集，为粒子物理领域的突破性发现开辟新途径。