Implicit regularization beyond one loop order: scalar field theories

Abstract

Implicit regularization (IR) has been shown as an useful momentum space tool for perturbative calculations in dimension specific theories, such as chiral gauge, topological and supersymmetric quantum field theoretical models at one loop level. In this paper, we aim at generalizing systematically IR to be applicable beyond one loop order. We use a scalar field theory as an example and pave the way for the extension to quantum field theories which are richer from the symmetry content viewpoint. Particularly, we show that a natural (minimal) renormalization scheme emerges, in which the infinities displayed in terms of integrals in one internal momentum are subtracted, whereas infrared and ultraviolet modes do not mix and therefore leave no room for ambiguities. A systematic cancelation of the infrared divergences at any loop order takes place between the ultraviolet finite and divergent parts of the amplitude for non-exceptional momenta leaving, as a byproduct, a renormalization group scale.

14 pages, two columns, 3 figures

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• Momentum routing invariance in Feynman diagrams and quantum symmetry breakings
• Systematization of Basic Divergent Integrals in Perturbation Theory and Renormalization Group Functions
• On the Bose symmetry and the left- and right-chiral anomalies
• Supercurrent anomaly and gauge invariance in N=1 supersymmetric Yang-Mills theory
• Advances towards the systematization of calculations with Implicit Regularization