SUSY QCD Corrections to Higgs-b Production : Is the \Delta_b Approximation Accurate?

TL;DR

This paper evaluates the accuracy of the  approximation in SUSY QCD corrections to Higgs production with b quarks, finding it reliable within a few percent across various parameters.

Contribution

It provides a detailed comparison between exact SUSY QCD calculations and the  approximation, confirming the latter's accuracy in Higgs-b production.

Findings

The  approximation reproduces exact results within a few percent.

SUSY QCD effects decouple at high masses.

The study covers a wide parameter space.

Abstract

The associated production of a Higgs boson with a b quark is a discovery channel for the lightest MSSM neutral Higgs boson. We consider the SUSY QCD contributions from squarks and gluinos and discuss the decoupling properties of these effects. A detailed comparison of our exact order(alpha_s) results with those of a widely used effective Lagrangian approach, the \Delta_b approximation, is presented. The \Delta_b approximation is shown to accurately reproduce the exact one-loop SQCD result to within a few percent over a wide range of parameter space.