FeynHiggsFast: a program for a fast calculation of masses and mixing angles in the Higgs Sector of the MSSM

TL;DR

FeynHiggsFast is a Fortran program that provides rapid calculations of Higgs boson masses and mixing angles in the MSSM using analytical approximations, achieving high accuracy compared to full diagrammatic results.

Contribution

It introduces a fast, analytical approximation formula for calculating Higgs masses and mixing angles in the MSSM up to two-loop order, with broad parameter space applicability.

Findings

Agreement better than 2 GeV with full diagrammatic calculations

Valid for arbitrary MSSM Higgs sector parameters

Includes leading logarithmic and non-logarithmic two-loop contributions

Abstract

FeynHiggsFast is a Fortran code for the calculation of the masses and the mixing angle of the neutral CP-even Higgs bosons in the MSSM up to two-loop order. It is based on a compact analytical approximation formula of the complete diagrammatic one-loop and the dominant two-loop contributions. At the one-loop level a leading logarithmic result is used, taking into account all sectors of the MSSM. At the two-loop level at O(alpha alpha_s) the leading logarithmic and non-logarithmic contributions are taken into account. The approximation formula is valid for arbitrary choices of the parameters in the Higgs sector of the model. Comparing its quality to the full diagrammatic result, we find agreement better than 2 GeV for most parts of the MSSM parameter space.