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.

除了大型强子对撞机的运行之外，欧洲核子研究中心还在“超越对撞机物理”计划下启动了几项在暗区寻找新物理的新实验。 RHUL 加速器科学小组利用 RHUL 独特的 BDSIM 专业知识和领导力，提供多物理模拟功能来理解实验光束线。前向搜索实验 (FASER) 将为暗光子、类轴子粒子和光规玻色子提供灵敏的搜索。 FASER 探测器位于 LHC 对撞机探测器无法到达的低 pT 盲点中 ATLAS 相互作用点下游 480 m 处，地理位置优越，可以对 LHC 产生的高能中微子进行首次探测和研究。 2020-21 年，FASER 原型探测器在 LHC Run3 期间安装运行。对于计划在 LHC Run 3 期间收集的 150 fb-1 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。凭借这样的速率和能量，FASER 将打开新物理学的窗口，为当前未探索的能量下的中微子截面提供新的约束，并约束前向粒子产生的模型。对于此类测量至关重要的是对到达 FASER 探测器的粒子光谱、通量和能量的精确模拟。这个由 Gibson 指导的博士项目将模拟 ATLAS 中 pp 碰撞事件的完整传播，通过加速器光学器件和周围材料，包括强子簇射的发展和二次生产，直到 FASER 探测器，其中信号和背景通量都将被评估。学生将使用RHUL的BDSIM软件为FASER创建一个精致的480m长的Geant4模型，从ATLAS洞穴开始，包含加速器晶格、孔径、磁铁和屏蔽的完整细节。应用该模型，学生将计算中微子和 μ 子通量，以便与大型强子对撞机第 3 次运行期间的测量信号进行比较，从而为 FASER 提供第一个结果。学生将有助于探测器校准、操作，并帮助分析第一个实验数据，在理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，学生将更新加速器模型，以研究和优化 FASER 2 的设计，FASER 2 是计划用于 HL-LHC 时代的更大探测器，进一步增强发现潜力。