Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages 1 figure; plenary talk at COSMO-99, Trieste, Italy, Sep 27 - Oct 2, 1999
Scientific paper
I review a computation of the baryon asymmetry arising from a first order electroweak phase transition in the Minimal Supersymmetric Standard model by classical force mechanism (CFM). I focus on CP violation provided by the charginos and show that it is the usually neglected sum of the two Higgsino fields, H_1+H_2, which gives a larger contribution to the baryon asymmetry than does the combination H_1-H_2. In fact, the latter contribution is exactly zero in CFM, because it is associated with a phase transformation of the fields. Baryogenesis is found to be most effective in MSSM CFM when only $\tilde t_R$ is light, which lends independent support for the "light stop scenario", and it remains viable for CP-violating phases as small as \delta_\mu \sim {\it few} \times 10^{-3}.
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