Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |d_e| < 1.05 x 10~(-27) e . cm [1] would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H ~3Δ_1 state of thorium monoxide (ThO) using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of δd_e = 1 × 10~(-28) e. cm√T, where T is the running time in days.
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机译：测量电子的非零电偶极力矩（EDM）在当前最佳限制的几个数量级内| D_E | <1.05 x 10〜（-27）e。 CM [1]将是标准模型之外的物理学的指示。 ACME协作通过使用缓慢的低温梁在钍一氧化钍（THO）的亚氧化物H〜3Δ_1状态下进行精密测量来搜索电子EDM。我们讨论了实验的当前状态。基于在2天的时间内从运行时间的14小时获取的数据集，我们已经实现了Δd_e= 1×10〜（-28）e的1 sigma统计不确定性。 cm√t，其中t是运行时间。
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