AI 中文总结
研究储存环中轴子暗物质的两种耦合，通过多束配置固定能量同时测两个可观测量及改变电场与磁场弯曲场比率两种方法，可提取耦合强度或清晰分离两种效应，用于未来EDM测量的储存环设施。
AI 中文摘要
储存环中的共振自旋进动实验对两种不同的轴子和类轴子暗物质耦合敏感：一种是主要由轴子 - 胶子相互作用驱动的振荡电偶极矩（EDM），另一种是轴子风（导数）耦合，它对自旋起有效伪磁场作用。两种效应在相同共振频率下产生垂直极化积累，在标准观测中是简并的。研究表明，两种耦合分别以共振强度的差和和进入垂直积累和自旋进动相位变化。在多束配置中固定能量同时测量两个可观测量，可提取单个耦合强度，但有两倍符号模糊性。作为补充方法，在保持共振频率固定时改变组合储存环中电场与磁场弯曲场的比率，可使轴子风贡献不变，以可计算方式改变EDM贡献，从而清晰分离两种效应。两种方法都可用于未来专门进行EDM测量的储存环设施。
英文摘要
Resonant spin-precession experiments in storage rings are sensitive to two distinct axion and axion-like particle dark-matter couplings: an oscillating electric dipole moment (EDM) primarily driven by the axion-gluon interaction, and the axion-wind (derivative) coupling acting as an effective pseudomagnetic field on the spin. Both effects produce a vertical polarization buildup at the same resonance frequency and are therefore degenerate in this standard observable. It is shown that the two couplings enter the vertical build-up and the spin-precession phase walk as the difference and sum of their resonance strengths, respectively. Measuring both observables simultaneously at fixed energy in a multi-bunch configuration allows the individual coupling strengths to be extracted up to a two-fold sign ambiguity. As a complementary approach, the ratio of electric to magnetic bending fields in a combined storage ring can be varied while keeping the resonance frequency fixed. This leaves the axion-wind contribution unchanged while modifying the EDM contribution in a calculable way, enabling a clean separation of the two effects. Both approaches can be used in future storage-ring facilities dedicated to EDM measurements.
Comments8 pages, 4 figures
