Symmetry preserving regularization with a cutoff
arXiv:1002.4490 · doi:10.2478/s11534-011-0039-y
Abstract
A Lorentz and gauge symmetry preserving regularization method is proposed in 4 dimension based on momentum cutoff. We use the conditions of gauge invariance or freedom of shift of the loop-momentum to define the evaluation of the terms carrying Lorentz indices, e.g. proportional to k_μk_ν. The remaining scalar integrals are calculated with a four dimensional momentum cutoff. The finite terms (independent of the cutoff) are unambiguous and agree with the result of dimensional regularization.
arXiv comment12 pages, 1 figure, v2 references added