期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 52, 期 23, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/ab4a61
关键词
electron electric dipole moment; beyond the standard model; shot-noise limit; spin precession measurement; excess noise suppression; fast polarization switching
资金
- NSF
Experimental searches for the electron electric dipole moment, de, probe new physics beyond the Standard Model. Recently, the ACME Collaboration set a new limit of vertical bar d(e)vertical bar < 1.1 x 10(-29) e . cm.(ACME Collaboration 2018 Nature 562 355-60), constraining time reversal symmetry (T) violating physics in the 3-100 TeV energy scale. ACME extracts d(e) from the measurement of electron spin precession due to the thorium monoxide (ThO) molecule's internal electric field. This recent ACME II measurement achieved an order of magnitude increased sensitivity over ACME I by reducing both statistical and systematic uncertainties in the measurement of the electric dipole precession frequency. The ACME II statistical uncertainty was a factor of 1.7 above the ideal shot-noise limit. We have since traced this excess noise to timing imperfections. When the experimental imperfections are eliminated, we show that shot noise limit is attained by acquiring noise-free data in the same configuration as ACME II.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据