A. Brignole et al., ASPECTS OF THE ELECTROWEAK PHASE-TRANSITION IN THE MINIMAL SUPERSYMMETRIC STANDARD MODEL, Physics letters. Section B, 324(2), 1994, pp. 181-191
We study the finite-temperature effective potential of the Minimal Sup
ersymmetric Standard Model in the full (M(A), tan beta) parameter spac
e. As for the features of the electroweak phase transition, we identif
y two possible sources of significant differences with respect to the
Standard Model: a stop sector with little supersymmetry breaking makes
the phase transition more strongly first-order, whereas a light CP-od
d neutral boson weakens its first-order nature. After including the le
ading plasma effects, T = 0 radiative corrections due to top and stop
loops, and the most important experimental constraints, we find that t
he danger of washing out any baryon asymmetry created at the electrowe
ak scale is in general no less than in the Standard Model.