Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-22
Phys.Rev. D64 (2001) 017302
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pp, 4 figures
Scientific paper
10.1103/PhysRevD.64.017302
A large lepton asymmetry could be generated in the Early Universe by oscillations of active to sterile neutrinos with a small mixing angle sin 2 \theta < 10^-2. The final order of magnitude of the lepton asymmetry \eta is mainly determined by its growth in the last stage of evolution when the MSW resonance dominates the kinetic equations. In this paper we present a simple way of calculating the maximum possible lepton asymmetry which can be created. Our results are in good agreement to previous calculations. Furthermore, we find that the growth of asymmetry does not obey any particular power law. We find that the maximum possible asymmetry at the freeze-out of the n/p ratio at T \sim 1 MeV strongly depends on the mass-squared difference \delta m^2: the asymmetry is negligible for \delta m^2 \ll 1 eV^2 and reaches asymptotically large values for \delta m^2 \ge 50 eV^2.
Buras Robert
Semikoz Dmitri V.
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