On the NLO QCD corrections to the production of the heaviest neutral Higgs scalar in the MSSM

TL;DR

This paper calculates the next-to-leading order QCD corrections to the production of the heaviest neutral Higgs in the MSSM, providing explicit formulas valid for a broad parameter space, enhancing precision in Higgs cross section predictions.

Contribution

It introduces a compact analytic approach for two-loop top-stop-gluino contributions, applicable without specific mass hierarchy assumptions, improving upon previous mass expansion methods.

Findings

Provides explicit two-loop correction formulas valid for a wide parameter range.

Enables more accurate and efficient Higgs production cross section calculations.

Complements earlier mass expansion results with a more general approach.

Abstract

We present a calculation of the two-loop top-stop-gluino contributions to Higgs production via gluon fusion in the MSSM. By means of an asymptotic expansion in the heavy particle masses, we obtain explicit and compact analytic formulae that are valid when the Higgs and the top quark are lighter than stops and gluino, without assuming a specific hierarchy between the Higgs mass and the top mass. Being applicable to the heaviest Higgs scalar in a significant region of the MSSM parameter space, our results complement earlier ones obtained with a Taylor expansion in the Higgs mass, and can be easily implemented in computer codes to provide an efficient and accurate determination of the Higgs production cross section.