O(alpha_s alpha_t) (non)decoupling effects within the top-sector of the MSSM

Abstract

In this paper we compute the $\mathcal{O}({\alpha }_s{\alpha }_t)$ threshold corrections to the running strong coupling constant, the top-Yukawa coupling and the top-quark mass within the MSSM. These parameters present a non-decoupling behaviour with the supersymmetry scale $M_{\mathrm{SUSY}}$. Our numerical analysis shows that the mixed QCD-Yukawa corrections can amount to few GeV for the running top-quark mass and range at the percent level for the top-Yukawa coupling.

Comments: References added; new lines in the plots displayed; more details about the calculation included