Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of Quenched QED3

Details Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of Quenched QED3 Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of Quenched QED3

2002-03-02

arxiv.org/abs/hep-ph/0203016v1

Phys.Rev.D66:025029,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 11 figures, uses revtex

Scientific paper

10.1103/PhysRevD.66.025029

We study three dimensional quenched Quantum Electrodynamics in the bare vertex approximation. We investigate the gauge dependence of the dynamically generated Euclidean mass of the fermion and the chiral condensate for a wide range of values of the covariant gauge parameter $\xi$. We find that (i) away from $\xi=0$, gauge dependence of the said quantities is considerably reduced without resorting to sophisticated vertex {\em ansatze}, (ii) wavefunction renormalization plays an important role in restoring gauge invariance and (iii) the Ward-Green-Takahashi identity seems to increase the gauge dependence when used in conjunction with some simplifying assumptions. In the Landau gauge, we also verify that our results are in agreement with those based upon dimensional regularization scheme within the numerical accuracy available.

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