Primordial Lepton Family Asymmetries in Seesaw Model

概要

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In the leptogenesis scenario, decays of heavy Majorana neutrinos generate lepton family asymmetries, Y_e, Y_μ. and Y_γ. These asymmetries are sensitive to CP violating phases in seesaw models. The time evolution of the lepton family asymmetries is derived by solving Boltzmann equations. Considering a minimal seesaw model, we show how each family asymmetry varies with one particular CP violating phase. For instance, we find the case in which the lepton asymmetry is dominated by Y_μ or Y_γ, depending on the choice of the CP violating phase. We also find the case in which the signs of the lepton family asymmetries Y_μ and Y_γ are opposite. Their absolute values can be larger than the total lepton asymmetry, and baryon asymmetry may result from the cancellation of the lepton family asymmetries.
理論物理学刊行会の論文
2004-01-25