Supersymmetric Higgs Yukawa Couplings to Bottom Quarks at next-to-next-to-leading Order

TL;DR

This paper calculates precise two-loop SUSY-QCD corrections to bottom quark Yukawa couplings in the MSSM, including resummation effects for large tan(beta), reducing theoretical uncertainties to a few percent.

Contribution

It provides the first comprehensive two-loop analysis of bottom Yukawa couplings in the MSSM, incorporating dominant corrections and resummation techniques.

Findings

Two-loop SUSY-QCD corrections are significant for accurate Yukawa coupling predictions.

Residual theoretical uncertainties are reduced to about one percent.

Resummation of large tan(beta) effects improves the reliability of the couplings.

Abstract

The effective bottom Yukawa couplings are analyzed for the minimal supersymmetric extension of the Standard Model at two-loop accuracy within SUSY-QCD. They include the resummation of the dominant corrections for large values of tg(beta). In particular the two-loop SUSY-QCD corrections to the leading SUSY-QCD and top-induced SUSY-electroweak contributions are addressed. The residual theoretical uncertainties range at the per-cent level.