Abstract
Abstract Antiprotonic helium, a neutral three-body system p e − He 2+ (= p He + ), produced when antiprotons ( p ) are captured in various phases of helium, comprises a series of long-lived (∼μs lifetime) states with large principal and orbital quantum numbers ( n , l ). In recent experiments at the CERN antiproton decelerator, comparing experimental values with three-body quantum electro-dynamics calculations, we deduced that the antiproton and proton charges and masses agree to within 6×10 −8 .
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