“…The energy levels of the atom can be calculated to the required accuracy within the framework of bound state quantum electrodynamics (QED) [5,6]. To present knowledge, leptons have no internal structure down to dimensions of 10 218 m and may therefore be considered pointlike objects [7]. Unlike in the natural atoms or in hydrogenlike systems, which contain at least one hadron, there is no complication in the theoretical description of M associated with the finite size and the internal structure of its constituent particles [8,9].…”
“…The energy levels of the atom can be calculated to the required accuracy within the framework of bound state quantum electrodynamics (QED) [5,6]. To present knowledge, leptons have no internal structure down to dimensions of 10 218 m and may therefore be considered pointlike objects [7]. Unlike in the natural atoms or in hydrogenlike systems, which contain at least one hadron, there is no complication in the theoretical description of M associated with the finite size and the internal structure of its constituent particles [8,9].…”
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