Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-04-24
Phys.Rev.D58:125014,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTEX 3.0, 15 pages,including 3 eps figures; revised version has minor changes to introduction and conclusion and additional
Scientific paper
10.1103/PhysRevD.58.125014
We study the dimensionally regularized fermion propagator Dyson-Schwinger equation in quenched nonperturbative QED. We work in arbitrary covariant gauge and perform nonperturbative renormalization numerically. The nonperturbative fermion propagator is solved in D = 4 - 2 * epsilon dimensional Euclidean space for a large number of values of epsilon. Results for D=4 dimensions are then obtained by extrapolation to epsilon = 0. Here we present results using the Curtis-Penningon fermion-photon proper vertex for two values of the coupling, namely alpha=0.6 and alpha=1.5, and compare these to previous studies employing a modified ultraviolet cut-off regularization. The results using the two different regularizations are found to agree to within the numerical precision of the present calculations.
Schreiber Andreas W.
Sizer Tom
Williams Anthony G.
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