On the electroweak phase transition in the Minimal Supersymmetric Standard Model

Details On the electroweak phase transition in the Minimal Supersymmetric Standard Model On the electroweak phase transition in the Minimal Supersymmetric Standard Model

1993-03-30

arxiv.org/abs/hep-ph/9303317v3

Phys.Lett. B307 (1993) 106-115

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 A4 pages, 7 figures available upon request, CERN-TH.6833/93, IEM-FT-69/93 (one paragraph expanded for clarity)

Scientific paper

10.1016/0370-2693(93)90199-R

We study the finite-temperature effective potential of the Minimal Supersymmetric Standard Model, in the limit of only one light Higgs boson. Because of the large top Yukawa coupling, there can be significant differences with respect to the Standard Model case: for given values of the Higgs and top masses, little supersymmetry breaking in the stop sector can make the phase transition more strongly first-order. After including the full structure of the stop mass matrix, the most important experimental constraints and the leading plasma effects, we find that the present limits on Higgs and squark masses are still compatible with the scenario of electroweak baryogenesis, in a small region of parameter space corresponding to $m_h \simlt 70 \gev$ and $\msba \simlt 105 \gev$.

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