ELECTRON MASS ANOMALOUS DIMENSION AT O(1 N(F)2) IN QUANTUM ELECTRODYNAMICS/

The critical exponent corresponding to the renormalization of the comp osite operator psipsiBAR is computed in quantum electrodynamics at O(1 /N(f)2) in arbitrary dimensions and covariant gauge at the non-trivial zero of the beta-function in the large N(f) expansion and the exponen t corresponding to the anomalous dimension of the electron mass which is a gauge independent object is deduced. Expanding in powers of epsil on = 2 - d/2 we check it is consistent with the known three loop pertu rbative structure and determine the subsequent coefficients in the cou pling constant expansion to all orders in MSBAR.