Séminaires et colloques

Determination of the fine-structure constant with 81 parts-per-trillion accuracy

by Dr Pierre Cladé (Laboratoire Kastler Brossel Université Pierre et Marie Curie)

Virtual ZOOM (LPSC)

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The fine-structure constant α is a crucial parameter in quantum electrodynamics theory especially for evaluating the magnetic moment of electron or muon predicted by the standard model.

By using a matter-wave interferometer to measure the recoil velocity, we obtained recently a new value of the fine-structure constant with an accuracy of 81 parts per trillion. Using this value of the fine-structure constant, we obtain the a prediction of the anomalous magnetic moment of the electron with a relative uncertainty below 0.1 ppt, which is the most accurate prediction of the standard model. This result is an important step in the way of testing the discrepancy observed in the magnetic moment anomaly of the muon in the electron sector.

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Code secret : 840281