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Ultracold eEDM: a new experiment to measure the electron's electric dipole moment using ultracold moelcules

超冷 eEDM：利用超冷分子测量电子电偶极矩的新实验

基本信息

批准号：
ST/S000011/1
负责人：
Michael Tarbutt
金额：
$ 163.91万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FS000011%2F1
关键词：
Ultracold eEDM new experiment measure

项目摘要

The visible Universe contains hardly any antimatter, but plenty of matter. The known fundamental forces barely distinguish between matter and antimatter so there must be undiscovered forces that account for this asymmetry. These new forces must influence the shapes of the fundamental particles, making them slightly aspherical. Measuring this distortion - known as the electric dipole - will reveal the existence and nature of the new forces. So far, measurements have detected only spherical particles, showing that their electric dipoles are exceedingly small. We aim to determine the shape of the electron by measuring the tiny interaction energy of the electric dipole with an applied electric field. This energy is enhanced when the electron is bound up in a polar molecule, an effect of special relativity. We will use a gas of ytterbium fluoride molecules, whose enhancement factor is a million, cooled to a temperature of 50 microkelvin. This deep cooling is a new technological advance that will make our measurement hundreds of times more sensitive than previous experiments. We will be sensitive to fundamental forces lying far beyond the energy range of the Large Hadron Collider, but we will not need a particle collider - the experiment will be done in a small laboratory in London. In the first two years, we will design and build the apparatus needed to make the measurement. Then we will optimize each part of the apparatus, and demonstrate that it is sensitive to the shape of the electron at the anticipated level. Finally, we will investigate potential systematic errors in the experiment - effects that might mimic the signature of an electric dipole - and eliminate these errors so that the experiment is perfected.

可见的宇宙几乎不包含任何反物质，但有大量的物质。已知的基本力几乎无法区分物质和反物质，因此一定存在未被发现的力来解释这种不对称。这些新的力一定会影响基本粒子的形状，使它们稍微呈非球面。测量这种被称为电偶极子的扭曲将揭示新力的存在和性质。到目前为止，测量只检测到球形粒子，表明它们的电偶极子非常小。我们的目标是通过测量电偶极子与外加电场的微小相互作用能来确定电子的形状。当电子被束缚在极性分子中时，这种能量会增强，这是狭义相对论的一种效应。我们将使用氟化镱分子气体，其增强因子为一百万，冷却到50微开尔文的温度。这种深度冷却是一项新的技术进步，它将使我们的测量比以前的实验灵敏几百倍。我们将对远远超出大型强子对撞机能量范围的基本力敏感，但我们不需要粒子对撞机——实验将在伦敦的一个小实验室进行。在头两年，我们将设计和建造进行测量所需的仪器。然后，我们将优化装置的每个部分，并证明它对电子形状的敏感性达到预期的水平。最后，我们将研究实验中潜在的系统误差——可能模仿电偶极子特征的效应——并消除这些误差，使实验更加完善。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Systematic errors arising from polarization imperfections in measurements of the electron's electric dipole moment

电子电偶极矩测量中极化缺陷引起的系统误差

DOI：
10.1103/physrevresearch.5.043233
发表时间：
2023
期刊：
Physical Review Research
影响因子：
4.2
作者：
Ho C
通讯作者：
Ho C

New techniques for a measurement of the electron's electric dipole moment

测量电子电偶极矩的新技术

DOI：
10.5281/zenodo.3751772
发表时间：
2020
期刊：
影响因子：
0
作者：
Ho C
通讯作者：
Ho C

An ultracold molecular beam for testing fundamental physics

DOI：
10.1088/2058-9565/ac107e
发表时间：
2021-04
期刊：
Quantum Science and Technology
影响因子：
6.7
作者：
X. Alauze;J. Lim;M. Trigatzis;S. Swarbrick;F. J. Collings;N. Fitch;B. Sauer;M. Tarbutt
通讯作者：
X. Alauze;J. Lim;M. Trigatzis;S. Swarbrick;F. J. Collings;N. Fitch;B. Sauer;M. Tarbutt

Methods for measuring the electron's electric dipole moment using ultracold YbF molecules