Hybrid calculation of the MSSM Higgs boson masses using the complex THDM as EFT

TL;DR

This paper enhances the hybrid calculation of MSSM Higgs boson masses by integrating the complex THDM as an EFT into FeynHiggs, enabling precise predictions across various SUSY particle mass regimes.

Contribution

It improves the implementation of the cTHDM-EFT calculation within the FeynHiggs framework, combining it with fixed-order calculations for better accuracy.

Findings

Accurate Higgs mass predictions in intermediate SUSY regimes

Enhanced predictions for Higgs decay rates and production cross-sections

Improved integration of EFT and fixed-order methods

Abstract

Recently, the Higgs boson masses in the Minimal Supersymmetric Standard Model (MSSM) and their mixing have been calculated using the complex Two-Higgs-DoubletModel (cTHDM) as an effective field theory (EFT) of the MSSM. Here, we discuss the implementation of this calculation, which we improve in several aspects, into the hybrid framework of FeynHiggs by combing the cTHDM-EFT calculation with the existing fixed-order calculation. This combination allows accurate predictions also in the intermediate regime where some SUSY particles are relatively light, some relatively heavy and some in between. Moreover, the implementation provides precise predictions for the Higgs decay rates and production cross-sections.