Measurement of the fine-structure constant as a test of the Standard Model

2018/04/12 by Richard H. Parker, Chenghui Yu, Weicheng Zhong +2 · 24 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Anomaly (physics) #Atomic and Molecular Physics #Consistency (knowledge bases) #Constant (computer programming) #Dark Matter and Cosmic Phenomena #Electron #Interferometry #Penning trap #Physics beyond the Standard Model #Recoil #Standard Model (mathematical formulation) #physics.atom-ph

paper · pdf · doi:10.1126/science.aap7706

published as Science 13 Apr 2018: Vol. 360, Issue 6385, pp. 191-195

openalex publication_date 2018/04/12 · openalex created_date 2018/04/24 · arxiv created 2018/12/12 · arxiv updated 2018/12/14 · openalex updated_date 2026/08/06

Abstract

Refining the fine-structure constant The fine-structure constant, α, is a dimensionless constant that characterizes the strength of the electromagnetic interaction between charged elementary particles. Related by four fundamental constants, a precise determination of α allows for a test of the Standard Model of particle physics. Parker et al. used matter-wave interferometry with a cloud of cesium atoms to make the most accurate measurement of α to date. Determining the value of α to an accuracy of better than 1 part per billion provides an independent method for testing the accuracy of quantum electrodynamics and the Standard Model. It may also enable searches of the so-called “dark sector” for explanations of dark matter. Science , this issue p. 191

Citations

• A Clock Directly Linking Time to a Particle's Mass
• Tenth-Order QED Contribution to the Electrong−2and an Improved Value of the Fine Structure Constant
• Atom Interferometry with up to 24-Photon-Momentum-Transfer Beam Splitters
• The Nubase2012 evaluation of nuclear properties
• CODATA recommended values of the fundamental physical constants: 2014

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