Measuring the muon EDM at Fermilab g-2 and confirming the hadronic contribution to the muon MDM using MuonE.

在费米实验室 g-2 测量 μ 子 EDM，并使用 MuonE 确认强子对 μ 子 MDM 的贡献。

• 批准号: 2751165
• 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: 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-2751165
• 关键词: Measuring; muon; EDM; Fermilab; confirming

The g-2 experiment monitors the orientation of a muon's spin as it precesses in a magnetic field by injecting positive muons into a storage ring and measuring the decay positrons as they orbit in the ring. The speed of the muons' precession is used to calculate the muon magnetic dipole moment (MDM) as well as the muon electric dipole moment (EDM).The g-factor is a proportionality constant that relates the muon MDM to its spin, charge, and mass. Originally Dirac calculated it as 2 for muons but because of interactions with virtual particles, the g-factor is altered, and the difference is quantified as the anomalous magnetic dipole moment (AMM). Many processes with virtual particles contribute to this slight alteration - these include processes containing new particles and thus the MDM measurement acts as a probe for New Physics. If there is a significant difference between the theoretical and experimental values for the g-factor (or for the EDM), this will expose new discrepancies within the Standard Model (SM). The size of the AMM and EDM can be used to restrict the properties of new particles and models. MUonE is also extremely important as it will help to ensure the validity of the g-2 discovery and the theoretical MDM value.Though hadronic contributions to the MDM are smaller than other contributions, they produce the largest uncertainties, and so to validate the g-2 theoretical prediction, the uncertainty from this sector must be reduced. This is done in the MUonE experiment by investigating muon-electron scattering, where a muon beam will scatter off a stationary electron target. MUonE will measure and determine the shape of the differential cross section of the process and use this to calculate the hadronic contribution to the MDM.I will be analysing the final g-2 data run taken at Fermilab and completing the EDM measurement, which will be the most sensitive measurement of the muon EDM. I will also be optimising the detector design and orientation and working on the tests and first runs of MUonE

g-2实验通过将正μ子注入储存环并测量衰变的正电子在环中的轨道运行来监测μ子在磁场中进动时的自旋方向。μ子进动的速度被用来计算μ子磁偶极矩（MDM）和μ子电偶极矩（EDM）。g因子是一个比例常数，它将μ子MDM与其自旋、电荷和质量联系起来。最初狄拉克将μ子的g因子计算为2，但由于与虚粒子的相互作用，g因子被改变，差异被量化为反常磁偶极矩（AMM）。许多含有虚粒子的过程都对这种微小的变化有贡献-这些过程包括含有新粒子的过程，因此MDM测量充当了新物理学的探针。如果g因子（或EDM）的理论值和实验值之间存在显著差异，这将暴露标准模型（SM）中的新差异。AMM和EDM的尺寸可用于限制新粒子和模型的性质。MUonE也是非常重要的，因为它将有助于确保g-2发现和MDM理论值的有效性。虽然强子对MDM的贡献比其他贡献小，但它们产生的不确定性最大，因此为了验证g-2理论预测，必须减少来自这个部门的不确定性。这是在MUonE实验中通过研究μ子-电子散射来完成的，其中μ子束将从静止的电子靶散射。MUonE将测量和确定过程的微分截面的形状，并使用它来计算强子对MDM的贡献。我将分析费米实验室的最终g-2数据运行，并完成EDM测量，这将是最灵敏的测量μ子EDM。我还将优化探测器的设计和方向，并进行MUone的测试和首次运行