Flavor projection effects in density-matrix equations permit misaligned asymmetry components from N2 and N3 to survive N1 washout in hierarchical seesaw leptogenesis, dividing parameter space into four regimes under low-energy neutrino constraints.
Wash-Out in N_2-dominated leptogenesis
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abstract
We study the wash-out of a cosmological baryon asymmetry produced via leptogenesis by subsequent interactions. Therefore we focus on a scenario in which a lepton asymmetry is established in the out-of-equilibrium decays of the next-to-lightest right-handed neutrino. We apply the full classical Boltzmann equations without the assumption of kinetic equilibrium and including all quantum statistical factors to calculate the wash-out of the lepton asymmetry by interactions of the lightest right-handed state. We include scattering processes with top quarks in our analysis. This is of particular interest since the wash-out is enhanced by scatterings and the use of mode equations with quantum statistical distribution functions. In this way we provide a restriction on the parameter space for this scenarios.
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Does thermal leptogenesis in a canonical seesaw rely on initial memory?
Flavor projection effects in density-matrix equations permit misaligned asymmetry components from N2 and N3 to survive N1 washout in hierarchical seesaw leptogenesis, dividing parameter space into four regimes under low-energy neutrino constraints.