2 papers
hep-ph1998
Non-perturbative energy levels of two-fermion bound states
Viktor Hund, Hartmut Pilkuhn
For the S-states of positronium and muonium, the terms of an expansion of energy levels in powers of the fine structure constant are also members of a "recoil series". The firs…
hep-ph1996
Binary Boosts
R. Haeckl, V. Hund, H. Pilkuhn
The relativistic motion of an isolated two--body system (bound or unbound) of given lab energy in QED is separated into cms motion and relative motion. The relative motion…