RUI: Refined Tests of Fundamental Symmetries

这个RUI项目侧重于基本对称性的精确测量。将进行三种不同的测量：1)目前的阿默斯特edm Cs测量将继续进行，实验的技术创新将导致比当前Cs限制提高20倍的值；2)测量PbO的a(1)态的超细分裂、同位素位移和g因子，为耶鲁大学正在启动的新的edm测量提供必要的支持；3)寻找局部洛伦兹不变性（LLI）和CPT的违反，现有的Amherst值为其提供了最佳的实验室极限，将得到更新。这项新的工作是由最近的理论结果推动的，这些理论结果提供了一个允许LLI和CPT不守恒的连贯理论。

This RUI project focuses on precision measurements of fundamental symmetries. Three different measurements are to be undertaken: 1) the current Amherst edm measurement in Cs will be continued, with technical innovations to the experiment that should result in a value that is improved by a factor of 20 over the current Cs limit; 2) measurements of the hyperfine splittings, isotope shifts, and g-factors for the a(1) state of PbO will be undertaken to provide essential support for the new edm measurement that is being initiated at Yale University; and 3) the search for a violation of local Lorentz invariance (LLI) and CPT, for which the existing Amherst value provides the best laboratory limits, will be renewed. This renewed undertaking is prompted by recent theoretical results that provide a coherent theory that allows for both LLI and CPT nonconservation.