Methods for measuring the electron's electric dipole moment using ultracold YbF molecules
Methods for measuring the electron's electric dipole moment using ultracold YbF molecules
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DOI：
10.1088/2058-9565/abc931
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发表时间：
2021-01-01
影响因子：
6.7
通讯作者：
Tarbutt, M. R.
中科院分区：
文献类型：
--
作者：
Fitch, N. J.;Lim, J.;Tarbutt, M. R.
电子的电偶极矩（eEDM）的测量要求超出标准模型的物理测试。我们描述了如何使用超冷YbF分子将eEDM测量的精度提高两到三个数量级。通过数值模拟，我们展示了磁聚焦、二维横向激光冷却和频率啁啾激光减速的组合如何产生强烈、缓慢、高度准直的分子束。我们展示了如何制作YbF分子的磁光阱以及如何将分子加载到光学晶格中。可以使用慢分子束或晶格中的分子来进行eEDM测量。我们估计了每种情况下可能达到的统计灵敏度，并考虑如何降低噪声源，以达到灵敏度的短噪声极限。我们还考虑了由于磁场和矢量光位移以及如何控制它们而产生的系统效应。
Measurements of the electron's electric dipole moment (eEDM) are demanding tests of physics beyond the standard model. We describe how ultracold YbF molecules could be used to improve the precision of eEDM measurements by two to three orders of magnitude. Using numerical simulations, we show how the combination of magnetic focussing, two-dimensional transverse laser cooling, and frequency-chirped laser slowing, can produce an intense, slow, highly-collimated molecular beam. We show how to make a magneto-optical trap of YbF molecules and how the molecules could be loaded into an optical lattice. eEDM measurements could be made using the slow molecular beam or using molecules trapped in the lattice. We estimate the statistical sensitivity that could be reached in each case and consider how sources of noise can be reduced so that the shot-noise limit of sensitivity can be reached. We also consider systematic effects due to magnetic fields and vector light shifts and how they could be controlled.