Infrared divergences, mass shell singularities and gauge dependence of the dynamical fermion mass

We study the behavior of the dynamical fermion mass when infrared divergences and mass shell singularities are present in a gauge theory. In particular, in the massive Schwinger model in covariant gauges we find that the pole of the fermion propagator is divergent and gauge dependent at one loop, but the leading singularities cancel in the quenched rainbow approximation. On the other hand, in physical gauges, we find that the dynamical fermion mass is finite and gauge independent at least up to one loop.

Note:

5pages, 3 figures, some minor clarifications included, to appear in Physics Letters B

11.15.-q
12.38.-t
12.20.-m
fermion: mass
fermion: propagator
gauge: covariance
fermion: pole
Schwinger model: massive
approximation: rainbow
gauge dependence

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Figures(3)

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