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arxiv: 1810.06270 · v2 · pith:XKU6ARFAnew · submitted 2018-10-15 · ✦ hep-ph

Unveiling Regions in multi-scale Feynman Integrals using Singularities and Power Geometry

classification ✦ hep-ph
keywords regionsequationsfeynmangeometrylandaumulti-scalepowersingularities
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We introduce a novel approach for solving the problem of identifying regions in the framework of Method of Regions by considering singularities and the associated Landau equations given a multi-scale Feynman diagram. These equations are then analyzed by an expansion in a small threshold parameter via the Power Geometry technique. This effectively leads to the analysis of Newton Polytopes which are evaluated using a Mathematica based convex hull program. Furthermore, the elements of the Gr\"{o}bner Basis of the Landau Equations give a family of transformations, which when applied, reveal regions like potential and Glauber. Several one-loop and two-loop examples are studied and benchmarked using our algorithm which we call ASPIRE.

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