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

本实验研究项目是利用超冷铯和铷原子在一维光学（1D）晶格陷阱中寻找非零电子电偶极矩（eEDM）的新项目。原子将被装载到一对平行的一维远谐振光学晶格阱中，这些阱位于空间的磁屏蔽区域。它们的edm将通过观察它们在两个阱中方向相反的电场中的相干演化来测量。预计灵敏度是10的30次方的3倍，比目前的极限提高了500倍。系统误差可以保持在或低于这个统计敏感性。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。这两种对称性在物理学的标准模型中都被违反了，但在很小的水平上。在这个实验的灵敏度下，对非零eEDM的观测将为粒子物理标准模型之外的现象提供明确的证据。目前受欢迎的涉及超对称的理论通常在当前极限的几个数量级内预测电子电火花加工。如果继续没有观测到edm，将对标准模型的扩展施加严格的限制。该项目更广泛的影响是培养本科生、研究生和博士后。

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.