测量μ子反常磁矩和电偶极矩的新方法
A New Approach for Measuring the Muon Anomalous Magnetic Moment and Electric Dipole Moment
摘要：
本文介绍了一种在J-PARC μ子装置上测量μ子磁矩异常$a_μ = (g-2)/2$和μ子电偶极矩（EDM）$d_μ$的新方法。我们的实验的目标是测量$a_μ$和$d_μ$使用一个独立的方法，与以前和正在进行的μ子$g-2$实验相比，μ子动量低10倍，存储环螺线管直径小20倍，存储磁场的质量前所未有。与目前实验方法的其他显著差异包括μ子束（再加速热μ子束）的横向发射度小1，000倍，其有效垂直注入螺线管，并跟踪μ子衰变的每个衰变正电子以获得其动量矢量。$a_μ$的精度目标是统计不确定度为450 ppb，与目前的实验不确定度相似，系统不确定度小于70 ppb。EDM的目标是灵敏度达到$1.5\times 10^{-21}~e\cdot\mbox{cm}$。
英文摘要：
This paper introduces a new approach to measure the muon magnetic moment anomaly $a_μ = (g-2)/2$, and the muon electric dipole moment (EDM) $d_μ$ at the J-PARC muon facility. The goal of our experiment is to measure $a_μ$ and $d_μ$ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon $g-2$ experiments with unprecedented quality of the storage magnetic field. Additional significant differences from the present experimental method include a factor of 1,000 smaller transverse emittance of the muon beam (reaccelerated thermal muon beam), its efficient vertical injection into the solenoid, and tracking each decay positron from muon decay to obtain its momentum vector. The precision goal for $a_μ$ is statistical uncertainty of 450 part per billion (ppb), similar to the present experimental uncertainty, and a systematic uncertainty less than 70 ppb. The goal for EDM is a sensitivity of $1.5\times 10^{-21}~e\cdot\mbox{cm}$.
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