Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-02
Phys.Rev. D53 (1996) 4578-4597
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages and 5 Postscript figures, uses harvmac and epsf; final version to appear in Phys.Rev.D; minor changes in the text
Scientific paper
10.1103/PhysRevD.53.4578
The baryon density which may be produced during the electroweak phase transition in supersymmetric models is computed, taking into account the previously neglected effects of transport, strong and weak anomalous fermion number violation, thermal scattering, and a new method for computing \cp\ violating processes during the transition. We can account for the observed baryon asymmetry, provided new \cp-violating phases are greater than $\sim 10^{-(2-4)}$, and some superpartners are light enough to be relevant during the transition, which takes place at a temperature of (50-100) GeV. In one case, light superpartners are the top squarks and the charginos and/or the neutralinos; in another case the top squarks and both Higgs doublets are light. Our calculation is easily extended to the case of a general two Higgs model, where we find sufficient baryogenesis provided that a certain combination of parameters in the Higgs potential leads to a \cp\ violating space dependent phase in the top quark mass of order $ 10^{-3}$.
Huet Patrick
Nelson Ann E.
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