Yukawa coupling corrections to stop, sbottom, and stau production in e+ e- annihilation

TL;DR

This paper computes one-loop Yukawa coupling corrections in the MSSM for e+ e- annihilation into stops, sbottoms, and staus, revealing corrections of about 5-10% to the production cross sections.

Contribution

It provides the complete analytical formulas and a detailed numerical analysis of Yukawa coupling corrections, including SUSY-QCD effects, for these processes.

Findings

Yukawa corrections are approximately ±10% for stop and sbottom production.

Yukawa corrections are about ±5% for stau production.

Corrections are significant for precision predictions in supersymmetric models.

Abstract

We calculate within the MSSM the one-loop Yukawa coupling corrections to the processes e+ e- \to stops, sbottoms, and staus in order of Yukawa coupling squared. These corrections are due to the exchange of charginos, neutralinos, charged and neutral Higgs bosons, and charged and neutral Higgs ghosts. We give the complete analytical formulae. We also perform a detailed numerical analysis of the Yukawa coupling corrections, including also the SUSY-QCD corrections. It turns out that for stop and sbottom production the Yukawa coupling corrections are typically +/- 10% of the tree-level cross section. For stau production they are about +/- 5%.