Search for the electron edm using Cs and Rb in 1D optical lattice traps

本实验研究计划是一维光学晶格陷阱中利用超冷铯和锶原子寻找非零电子电偶极矩(EEDM)的新项目。原子将被加载到一对平行的一维远离共振的光学晶格陷阱中，这些陷阱位于空间的磁屏蔽区。通过观察它们在两个陷阱中相反方向的电场中的相干演化，可以测量它们的EDM。预计的灵敏度是十分之三到三十分之一，比目前的限制提高了500倍。系统误差可以保持在或低于这个统计敏感度。具有永久EDM的粒子意味着时间反转(T)不变性和宇称(P)不变性都被违反。这两个对称性在标准物理模型中都被破坏了，但在很小的水平上。在这个实验的灵敏度下观察到非零的电火花加工将为粒子物理标准模型之外的现象提供确凿的证据。目前流行的超对称性理论通常预测电子电火花加工在电流极限的几个数量级内。继续没有观测到eEDM将对标准模型的扩展施加严格的限制。该计划更广泛的影响是对本科生、研究生和博士后研究员的学生培训。

This experimental research program is a new project to search for a non-zero electron electric dipole moment (eEDM) using ultracold cesium and rubidium atoms in one-dimensional optical (1D) lattice traps. Atoms will be loaded into a pair of parallel 1D far-off-resonant optical lattice traps in a magnetically shielded region of space. Their EDMs will be measured by observing their coherent evolution in electric fields that are directed oppositely in the two traps. The projected sensitivity is three parts in ten to the 30th, a 500-fold improvement over the current limit. Systematic errors can be kept at or below this statistical sensitivity. A particle with a permanent edm implies that both time-reversal (T) invariance and parity (P) invariance are violated. Both of these symmetries are violated in the standard model of physics, but at very small levels. Observation of a non-zero eEDM at the sensitivity of this experiment would provide definitive evidence for phenomena beyond the Standard Model of particle physics. Currently favored theories involving supersymmetry typically predict an electron EDM within a few orders of magnitude of the current limit. Continued non-observation of eEDMs would place stringent limits on extensions to the Standard Model. The broader impact of the program is student training of undergraduates, graduate students, and postdoctoral fellows.