Radiative Corrections in Bound States: Recent Results
Abstract
Two recent studies of radiative corrections to bound state properties are discussed. The change of the decay rate of a muon bound to a light nucleus has been calculated for several light nuclei 4≤ Z ≤ 9 with high precision, resolving a long-standing discrepancy between analytical and numerical results for oxygen (Z=8). The decay of parapositronium into three photons has been calculated including effects of the Z boson. The resulting rate is many orders of magnitude smaller than previously estimated.
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