Implicit regularization beyond one loop order: scalar field theories

Details Implicit regularization beyond one loop order: scalar field theories Implicit regularization beyond one loop order: scalar field theories

2006-05-11

arxiv.org/abs/hep-th/0605116v2

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, two columns, 3 figures

Scientific paper

10.1088/0954-3899/34/10/011

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.

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