Problems of the Strategy of Regions

TL;DR

This paper discusses challenges in applying the strategy of regions for asymptotic expansions of Feynman integrals, illustrating issues with two-loop diagrams and reformulating the approach using alpha parameters.

Contribution

It identifies problems in the existing strategy of regions and proposes a reformulation in terms of alpha parameters to address these issues.

Findings

Highlights limitations of the current strategy of regions

Provides characteristic examples with two-loop diagrams

Reformulates the strategy using alpha parameters

Abstract

Problems that arise in the application of general prescriptions of the so-called strategy of regions for asymptotic expansions of Feynman integrals in various limits of momenta and masses are discussed with the help of characteristic examples of two-loop diagrams. The strategy is also reformulated in the language of alpha parameters.