Threshold Corrections to the MSSM Finite-Temperature Higgs Potential

In the minimal supersymmetric standard model (MSSM) the one-loop finite-temperature corrections from the squark-Higgs bosons sector are calculated, the effective two-Higgs-doublet potential is reconstructed and possibilities of the electroweak phase transition in full MSSM ( H m , tan ,,t bA, , Qm, Um, Dm) parameter space are studied. At large values of,t bA and of around 1 TeV, favored indirectly by LEP2 and Teva-tron data, the threshold finite-temperature corrections from triangle and box diagrams with intermediate third generation squarks are very substantial. Four types of bifurcation sets are defined for the two-Higgs-doublet potential. High sensitivity of the low-temperature evolution to the effective two-doublet and the MSSM squark sector parameters is observed, but rather extensive regions of the full MSSM parameter space allow the first-order electroweak phase transition respecting the phenomenological constraints at zero temperature. As a rule, these regions of the MSSM parameter space are in line with the case of a light stop quark