FeynHiggs: a program for the calculation of the masses of the neutral CP-even Higgs bosons in the MSSM

TL;DR

FeynHiggs addresses the need for precise predictions of the MSSM neutral CP-even Higgs masses mh and mH by implementing a diagrammatic calculation that includes full one-loop on-shell results, leading two-loop QCD corrections, and additional electroweak and higher-order QCD refinements. The approach handles arbitrary stop and Higgs-sector parameters, using renormalized self-energies and propagator-pole conditions to obtain the masses, and incorporates a Δρ calculation to constrain the SUSY spectrum. The Fortran code combines a modular front-end with a self-contained core subroutine, enabling fast evaluations and straightforward integration with other tools, and is designed to facilitate phenomenological studies and collider constraint analyses. The work also discusses agreement with RG methods in certain limits and highlights potential deviations in scenarios with significant stop mixing, underscoring the importance of diagrammatic two-loop effects for accurate mass predictions.

Abstract

FeynHiggs is a Fortran code for the calculation of the masses of the neutral CP-even Higgs bosons in the MSSM up to two-loop order. It is based on the complete diagrammatic on-shell results at the one-loop level, the leading diagrammatic two-loop QCD contributions and further improvements taking into account leading electroweak two-loop and leading higher-order QCD corrections. The Higgs-boson masses are calculated as functions of the MSSM parameters for general mixing in the scalar top sector and arbitrary choices of the parameters in the Higgs sector of the model.