Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-08
Phys.Rev. D73 (2006) 115009
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 8 figures, 1 table. v2: Added references, corrected typos. Added constraints from two-loop contributions to electron
Scientific paper
10.1103/PhysRevD.73.115009
We derive the contributions to the quantum transport equations for electroweak baryogenesis due to decays and inverse decays induced by tri-scalar and Yukawa interactions. In the Minimal Supersymmetric Standard Model (MSSM), these contributions give rise to couplings between Higgs and fermion supermultiplet densities, thereby communicating the effects of CP-violation in the Higgs sector to the baryon sector. We show that the decay and inverse decay-induced contributions that arise at zeroth order in the strong coupling, \alpha_s, can be substantially larger than the O(\alpha_s) terms that are generated by scattering processes and that are usually assumed to dominate. We revisit the often-used approximation of fast Yukawa-induced processes and show that for realistic parameter choices it is not justified. We solve the resulting quantum transport equations numerically with special attention on the impact of Yukawa rates and study the dependence of the baryon-to-entropy ratio Y_B on MSSM parameters.
Cirigliano Vincenzo
Lee Christopher C.
Ramsey-Musolf Michael. J.
Tulin Sean
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