Thursday, June 27, 2013

1306.6307 (Ashok K. Das et al.)

The pole of the fermion propagator in a general class of gauges    [PDF]

Ashok K. Das, J. Frenkel
We study the behavior of the pole of the fermion propagator, in QED in $n$-dimensions, in a general class of gauges which interpolate between the covariant, the axial and the Coulomb gauges. We use Nielsen identities, following from the BRST invariance of the theory, to determine the gauge variation of the fermion two point function in this general class of gauges. This allows us to show directly and in a simple manner, to all orders in perturbation theory, that in the absence of infrared divergences and mass shell singularities, the fermion pole mass is gauge independent.
View original: http://arxiv.org/abs/1306.6307

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