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

在一维光学晶格陷阱中使用 Cs 和 Rb 搜索电子电火花

基本信息

批准号：
0651769
负责人：
David Weiss
金额：
$ 36.44万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2007
资助国家：
美国
起止时间：
2007-05-01 至 2011-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0651769&HistoricalAwards=false
关键词：
Search electron edm using Cs

项目摘要

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.

该实验研究计划是一个新项目，旨在在一维光学（1D）晶格陷阱中使用超冷铯和铷原子来寻找非零电子电偶极矩（eEDM）。原子将被加载到空间磁屏蔽区域中的一对平行一维远非共振光学晶格陷阱中。将通过观察两个陷阱中方向相反的电场的相干演化来测量它们的 EDM。预计灵敏度为十分之三至三十，比当前限制提高了 500 倍。系统误差可以保持在或低于该统计灵敏度。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。这两种对称性在物理标准模型中都被违反，但程度非常小。在该实验的灵敏度下观察非零 eEDM 将为超出粒子物理标准模型的现象提供明确的证据。当前流行的涉及超对称性的理论通常预测电子电火花在电流极限的几个数量级内。继续不遵守 eEDM 将对标准模型的扩展施加严格限制。该项目更广泛的影响是对本科生、研究生和博士后的学生培训。