The Electroweak Phase Transition in a Nonminimal Supersymmetric Model

Details The Electroweak Phase Transition in a Nonminimal Supersymmetric Model The Electroweak Phase Transition in a Nonminimal Supersymmetric Model

1992-07-09

arxiv.org/abs/hep-ph/9207227v1

Nucl.Phys. B402 (1993) 27-45

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, LaTeX, DFPD/92/TH/36

Scientific paper

10.1016/0550-3213(93)90635-3

We study the electroweak phase transition in a supersymmetric version of the Standard Model, in which a gauge singlet superfield is added to the Higgs sector. We show that the order of the transition is determined by the trilinear soft supersymmetry breaking terms rather than by the $O ( m^{3} T )$ term in the 1-loop, $T\neq0$ corrections. This fact removes the Standard Model upper bound on the Higgs mass, $ m_{H} < 55 GeV$, coming from the requirement that baryon asymmetry is not washed out by anomalous electroweak processes. We perform a numerical analysis of parameter space including in the effective potential top-stop contribution to 1-loop radiative corrections. We find that this model is compatible with the preservation of baryon asymmetry for masses of the lightest scalar up to about 170 GeV.

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