Partons, Electromagnetic Mass Shifts, and the Approach to Scaling

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Abstract
In parton models the most singular part of the electromagnetic level shift of a physical state is predicted to be a weighted sum of the level shifts of the partons. This leads to a tadpole model for masses squared. Requiring consistency of this result with Cottingham's formula leads to a prediction of the cross section for absorption of virtual scalar as well as transverse photons in the Bjorken scaling limit. If these cross sections are in a particular ratio to each other, mass shifts or differences will be finite in conventional electrodynamics.