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- W1969001966 abstract "Using the non-equilibrium Green function method (Kadanoff-Baym equations) in the expanding universe, we investigate evolution of the lepton number asymmetry when the right-handed (RH) neutrinos have almost degenerate masses $|M_i^2-M_j^2| ll M_i^2$. The resonantly enhanced $CP$-violating parameter $varepsilon_i$ associated with the decay of the RH neutrino $N_i$ is obtained. It is proportional to an enhancement factor $(M_i^2-M_j^2) M_i Gamma_j/ ((M_i^2-M_j^2)^2 +R_{ij}^2)$ with the regulator $R_{ij}=M_i Gamma_i+M_j Gamma_j$. The result is consistent with the previous result obtained by Garny et al., in a constant background with an out-of-equilibrium initial state. We discuss the origin of such a regulator, and why it is not like $R_{ij}=M_i Gamma_i-M_j Gamma_j$." @default.
- W1969001966 created "2016-06-24" @default.
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- W1969001966 date "2014-04-01" @default.
- W1969001966 modified "2023-10-14" @default.
- W1969001966 title "Kadanoff-Baym approach to the thermal resonant leptogenesis" @default.
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- W1969001966 doi "https://doi.org/10.1007/jhep04(2014)062" @default.
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