Loop integrals in three outstanding gauges: Feynman, light-cone, and Coulomb

We apply the negative dimensional integration method (NDIM) to three outstanding gauges: Feynman. light-cone, and Coulomb gauges. Our aim is to show that NDIM is a very suitable technique to deal with loop integrals, regardless of which gauge choice that originated them. In the Feynman gauge we perform scalar two-loop four-point massless integrals: in the light-cone gauge we calculate scaler two-loop integrals contributing to two-point functions without any kind of prescriptions. since NDIM can abandon such devices-this calculation is the first test of our prescriptionless method beyond one-loop order: and finally. for the Coulomb gauge we consider a four-propagator massless loop integral, in the split-dimensional regularization context. (C) 2001 Academic Press.