Search for the electric dipole moment of the electron with thorium monoxide
Amar C. Vutha, Wesley C. Campbell, Yulia V. Gurevich, Nicholas R. Hutzler, Maxwell Parsons, David Patterson, Elizabeth Petrik, Benjamin Spaun, John M. Doyle, Ge… 展开作者
Amar C. Vutha, Wesley C. Campbell, Yulia V. Gurevich, Nicholas R. Hutzler, Maxwell Parsons, David Patterson, Elizabeth Petrik, Benjamin Spaun, John M. Doyle, Gerald Gabrielse, David DeMille
The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the Standard Model. We describe an ongoing experiment to measure or set improved limits to the eEDM, using a cold beam of thorium monoxide (ThO) molecules. The metastable $H {}^3Δ_1$ state in ThO has important advantages for such an experiment. We argue that the statistical uncertainty of an eEDM measurement could be improved by as much as 3 orders of magnitude compared to the current experimental limit, in a first-generation apparatus using a cold ThO beam. We describe our measurements of the $H$ state lifetime and the production of ThO molecules in a beam, which provide crucial data for the eEDM sensitivity estimate. ThO also has ideal properties for the rejection of a number of known systematic errors; these properties and their implications are described.
Reply to the Comment on "Theoretical study of thorium monoxide for the electron electric dipole moment search: Electronic properties of $H^3Δ_1$ in ThO"
我们回答评论[M]。Denis，T. Fleig，arXiv：1605.03091v1（2016）]在论文[L.V.Skripnikov and A.V.Titov，J.Chem.Phys.142，024301（2015）]上。
Optical cycling on thorium monoxide (ThO) for an improved test of fundamental symmetries
Facility for Rare Isotope Beams, Michigan State University（密歇根州立大学稀有同位束设施）；Department of Physics and Astronomy, Michigan State University（密歇根州立大学物理与天文学系）
在当前最佳极限|d_e| < 1.05 e-27 e cm的几个数量级内测量电子的非零电偶极矩（EDM）将是物理学超出标准模型的指示。ACME合作正在寻找一种电子EDM，通过使用缓慢的低温束在一氧化钍（ThO）的亚稳态H状态下进行电子自旋进动的精确测量。我们讨论了实验的现状。基于在2天的时间内从14小时的运行时间获得的数据集，我们已经实现了1-sigma统计不确定性为1 e-28 e cm/T^（1/2），其中T是以天为单位的运行时间。
A cryogenic buffer gas beam source with in-situ ablation target replacement
University of Chicago（芝加哥大学）；Harvard University（哈佛大学）；Harvard-MIT Center for Ultracold Atoms（哈佛-麻省理工学院超冷原子中心）；Northwestern University（西北大学）；Okayama University（冈山大学）；Michigan State University（密歇根州立大学）
