Table of Contents
Atoms, Volume 7, Issue 2 (June 2019)
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Cover Story (view full-size image) The measurements of electron and positron magnetic moments underway should improve 10-fold upon a 3 [...] Read more. The measurements of electron and positron magnetic moments underway should improve 10-fold upon a 3 parts in 1013 determination that is already the most precise measurement of the properties of an elementary particle. Motivations are the most stringent test of the most precise prediction of the “Standard Model of Particle Physics”, and the most stringent lepton test of its fundamental CPT symmetry invariance. One particle confined in the magnetic field of a Penning trap is cooled to its lowest quantum cyclotron and spin states, with spontaneous emission from the first excited cyclotron states substantially inhibited using a cavity. Simultaneously driven one-quantum excitations are detected with a quantum non-demolition method, and quantum jump spectroscopy determines the spin and cyclotron frequencies that determine the magnetic moment. View this paper