Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-01-04
Int.J.Mod.Phys.A25(2010)4255-4290
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, 2 figures, revtex4, publsihed in Int. J. Mod. Phys. A
Scientific paper
10.1142/S0217751X10050329
We demonstrate our simple strategy for renormalization with QED at one-loop level, basing on an elaboration of the effective field theory philosophy. No artificial regularization or deformation of the original theory is introduced here and hence no manipulation of infinities, ambiguities arise instead of infinities. Ward identities first come to reduce the number of ambiguities, the residual ones could in principle be removed by imposing physical boundary conditions. Renormalization group equations arise as "decoupling theorems" in the underlying theory perspective. In addition, a technical theorem concerning routing of external momenta is also presented and illustrated with the self-energy and vertex function as examples.
Pan Zhao-Ting
Yang Ji-Feng
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