We consider an electron which is electromagnetically dressed in such a way that it is both gauge invariant and that it has the associated electric and magnetic fields expected of a moving charge. We study the propagator of this dressed electron and, for small velocities, show explicitly at one loop that at the natural (on-shell) renormalisation point, p0 = m, p = mv, one can renormalise the propagator multiplicatively. Furthermore the renormalisation constants are infra-red finite. This shows that the dressing we use corresponds to a slowly moving, physical asymptotic field.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 7 Mar 1996|
Bagan, E., Lavelle, M., & McMullan, D. (1996). The physical propagator of a slowly moving charge. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 370(1-2), 128-134. https://doi.org/10.1016/0370-2693(96)00049-4