Abstract
Starting from operator equations of motion and making arguments based on a separation of time scales, a set of equations is derived which govern the non-equilibrium time evolution of a GeV-scale sterile neutrino density matrix and active lepton number densities at temperatures T ≳ 130 GeV. The density matrix possesses generation and helicity indices; we demonstrate how helicity permits for a classification of various sources for leptogenesis. The coefficients parametrizing the equations are determined to leading order in Standard Model couplings, accounting for the LPM resummation of 1 + n ↔ 2 + n scatterings and for all 2 ↔ 2 scatterings. The regime in which sphaleron processes gradually decouple so that baryon plus lepton number becomes a separate non-equilibrium variable is also considered.
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ArXiv ePrint: 1703.06087
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Ghiglieri, J., Laine, M. GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations. J. High Energ. Phys. 2017, 132 (2017). https://doi.org/10.1007/JHEP05(2017)132
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DOI: https://doi.org/10.1007/JHEP05(2017)132