Radiative corrections to positronium energy levels |
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| Authors: | W Buchmüller E Remiddi |
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| Institution: | Physikalisches Institut der Universität Bonn, Germany;Max-Planck-Institut für Physik und Astrophysik, Munich, Germany |
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| Abstract: | A systematic perturbation theory for the computation of positronium energy levels is presented. The proposed method is based on the Bethe-Salpeter equation and a zeroth-order kernel for which exact solutions are known explicitly. The cancellation of ultraviolet divergences arising in the perturbation series is discussed, and new contributions to the ground-state hyperfine splitting of positronium are evaluated up to order α6. |
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