H. Eberl et al., Yukawa coupling corrections to stop, sbottom, and stau production in e(+)e(-) annihilation, J HIGH EN P, (5), 1999, pp. NIL_358-NIL_374
We calculate within the MSSM the one-loop Yukawa coupling corrections to th
e processes e+e- --> (t) over tilde(i)(t) over tilde(j), (b) over tilde(i)(
b) over tilde(j), <(tau)over tilde>(i)<(tau)over tilde>(j) in order of Yuka
wa coupling squared. These corrections are due to the exchange of charginos
, neutralinos, charged and neutral Higgs bosons, and charged and neutral Hi
ggs ghosts. We give the complete analytical formulae. We also perform a det
ailed numerical analysis of the Yukawa coupling corrections, including also
the SUSY-QCD corrections. It turns out that for stop and sbottom productio
n the Yukawa coupling corrections are typically similar to +/-10% of the tr
ee-level cross section. For stau production they are about +/-5%.