Simulations and analysis for FASER and the Forward Physics Facility

FASER 和前沿物理设施的模拟和分析

• 批准号: 2781166
• 金额: --
• 依托单位: Royal Holloway University of London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2781166
• 关键词: Simulations; analysis; FASER; Forward; Physics

Alongside operation of the Large Hadron Collider, several new experiments searching for new physics in the Dark Sector have been initiated at CERN under the Physics Beyond Colliders programme. The RHUL Accelerator Science group provides multi-physics simulation capability to understand the experimental beamlines, using RHUL's unique BDSIM expertise and leadership.The ForwArd Search ExpeRiment (FASER) will provide sensitive searches for dark photons, axion-like particles, and light gauge bosons. Placed 480 m downstream of the ATLAS interaction point in the low pT blind spot that is inaccessible to the LHC collider detectors, the FASER detector is also ideally located to provide the first detection and studies of high-energy neutrinos produced at the LHC. In 2020-21, the FASER prototype detector was installed for operation during LHC Run3. For an integrated luminosity of 150 fb-1 planned to be collected during LHC Run 3, assuming SM cross sections, 1300 e, 20,000 , and 20 will interact in FASER, with mean energies of 600 Ge to 1 Te. With such rates and energies, FASER will open up windows on new physics, provide new constraints on neutrino cross sections at currently unexplored energies, and constrain models for forward particle production. Vital to such measurements are accurate simulations of the particle spectra, flux and energies reaching the FASER detector. This PhD project, supervised by Gibson, will simulate the full propagation of events from pp collisions in ATLAS, through the accelerator optics and surrounding material, including hadronic shower development and secondary production, up to the FASER detector, where both the signal and background flux will be evaluated. The student will use RHUL's BDSIM software to create an exquisite 480m long Geant4 model for FASER, starting from the ATLAS cavern, with full details of the accelerator lattice, apertures, magnets and shielding. Applying this model, the student will calculate the neutrino and muon flux to allow comparison with measured signals during Run 3 of the LHC, enabling first results for FASER. The student will contribute to detector calibration, operation, and help to analyse first experimental data, playing a timely and key role to understand the anticipated signal and backgrounds. Pending the successful first phase, the student will update the accelerator model to study and optimise the design of FASER 2, a larger detector planned for the HL-LHC era, that further enhances the discovery potential.

在大型强子对撞机运行的同时，欧洲核子研究中心在“超越对撞机的物理”项目下启动了几项在黑暗领域寻找新物理的新实验。RHUL加速器科学小组利用RHUL独特的BDSIM专业知识和领导能力，提供多物理场模拟能力，以了解实验光束线。前向搜索实验（FASER）将提供对暗光子、类轴子粒子和轻型玻色子的灵敏搜索。FASER探测器位于ATLAS相互作用点下游480米的低pT盲区，这是LHC对撞机探测器无法到达的，FASER探测器也处于理想的位置，可以首次探测和研究LHC产生的高能中微子。在2020- 2021年，FASER原型探测器在LHC Run3期间安装运行。对于在LHC运行3期间计划收集的150 fb-1的综合光度，假设SM横截面，1300 e, 20,000和20将在FASER中相互作用，平均能量为600 Ge至1 Te。有了这样的速率和能量，FASER将打开新物理学的窗口，在目前尚未探索的能量下对中微子横截面提供新的约束，并约束正向粒子产生的模型。对这些测量至关重要的是精确模拟到达FASER探测器的粒子光谱、通量和能量。这个博士项目，由Gibson监督，将模拟ATLAS中pp碰撞事件的完整传播，通过加速器光学和周围材料，包括强子雨的发展和二次生产，直到FASER探测器，在那里信号和背景通量将被评估。该学生将使用RHUL的BDSIM软件为FASER创建一个精美的480米长的Geant4模型，从ATLAS洞穴开始，具有加速器晶格，孔径，磁铁和屏蔽的全部细节。应用该模型，学生将计算中微子和介子通量，以便与LHC运行3期间测量的信号进行比较，从而为FASER提供第一个结果。该学生将参与探测器的校准，操作，并帮助分析第一次实验数据，在了解预期信号和背景方面发挥及时和关键的作用。在第一阶段成功之前，该学生将更新加速器模型，以研究和优化FASER 2的设计，FASER 2是一个更大的探测器，计划用于HL-LHC时代，进一步提高发现潜力。