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2018
DOI: 10.1126/science.aap7706
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Measurement of the fine-structure constant as a test of the Standard Model

Richard H. Parker,
Chenghui Yu,
Weicheng Zhong
et al.

Abstract: Measurements of the fine-structure constant α require methods from across subfields and are thus powerful tests of the consistency of theory and experiment in physics. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer, we recorded the most accurate measurement of the fine-structure constant to date: α = 1/137.035999046(27) at 2.0 × 10 accuracy. Using multiphoton interactions (Bragg diffraction and Bloch oscillations), we demonstrate the largest phase (12 million radians) of any Ram… Show more

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Cited by 1,151 publications

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“…Based on QED, such couplings would lead to a nonzero shift in electron's gyromagnetic anomaly δae. We note that dark photons cause a δae>0, opposite to the sign measured in both our experiment and the rubidium measurement . Thus, a model consisting of the Standard Model and dark photons of any mass mV or coupling cV is incompatible with the data at as high as 99% C.L.…”
Section: Discussion
contrasting
confidence: 83%