Two-Loop QED Bound-State Calculations and Squared Decay Rates

Details Two-Loop QED Bound-State Calculations and Squared Decay Rates Two-Loop QED Bound-State Calculations and Squared Decay Rates

2003-07-04

arxiv.org/abs/hep-ph/0307060v1

Can.J.Phys. 80 (2002) 1213-1223

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 figures, LaTeX

Scientific paper

10.1139/p02-081

We discuss the epsilon-method as used in various recent QED bound-state calculations by considering mathematical model examples. Recently obtained results for higher-order self-energy binding corrections at the two-loop level are reviewed. Problems associated with the interpretation of squared decay rates as radiative bound-state energy level shifts are discussed. We briefly expand on the relation of squared decay rates to nonresonant and radiative corrections to the Lorentzian line shape, including their dependence on the experimental process under study.

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