A new light-front formulation of QED is developed, within the framework of standard perturbation theory, in which x ϩ plays the role of the evolution parameter and the gauge choice is A ϩ ϭ0 ͑light-front ''temporal'' gauge͒. It is shown that this formulation leads to the Mandelstam-Leibbrandt causal prescription for the noncovariant singularities in the photon propagator. Furthermore, it is proved that the dimensionally regularized one loop off-shell amplitudes exactly coincide with the correct ones, as computed within the standard approach using ordinary space-time coordinates. ͓S0556-2821͑98͒10820-2͔
A new light-front formulation of Q.E.D. is developed, within the framework of standard perturbation theory, in which x + plays the role of the evolution parameter and the gauge choice is A + = 0 (light-front "temporal" gauge). It is shown that this formulation leads to the Mandelstam-Leibbrandt causal prescription for the non-covariant singularities in the photon propagator. Furthermore, it is proved that the dimensionally regularized one loop off-shell amplitudes exactly coincide with the correct ones, as computed within the standard approach using ordinary space-time coordinates.
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