RUI: Refined Tests of Fundamental Symmetries

这个RuI项目专注于基本对称性的精确测量。将进行三种不同的测量：1)将继续目前的以Cs为单位的Amherst EDM测量，对实验进行技术创新，使值应比目前的Cs限制提高20倍；2)将测量a(1)状态的PbO的超精细分裂、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；以及3)将更新对违反当地洛伦兹不变性(LLI)和CPT的搜索，现有的Amherst值为其提供了最佳实验室限制。这一新的承诺是由最近的理论结果推动的，这些结果提供了一个一致的理论，既允许LLI，也允许CPT非守恒。

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.