Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-08-18
Phys.Lett. B417 (1998) 79-86; Erratum-ibid. B448 (1999) 321
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 1 figure, corrected some criticisms of hep-ph/9702409; to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(97)01361-0
We calculate the baryon asymmetry generated at the electroweak phase transition in the minimal supersymmetric standard model, treating the particles in a WKB approximation in the bubble wall background. A set of diffusion equations for the particle species relevant to baryon generation, including source terms arising from the CP violation associated with the complex phase $\delta$ of the $\mu$ parameter, are derived from Boltzmann equations, and solved. The conclusion is that $\delta$ must be $\gsim 0.1$ to generate a baryon asymmetry consistent with nucleosynthesis. We compare our results to several other recent computations of the effect, arguing that some are overestimates.
Cline James
Joyce Meridith
Kainulainen Kimmo
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