CP Violation and Baryogenesis due to Heavy Majorana Neutrinos

Details CP Violation and Baryogenesis due to Heavy Majorana Neutrinos CP Violation and Baryogenesis due to Heavy Majorana Neutrinos

1997-07-03

arxiv.org/abs/hep-ph/9707235v1

Phys.Rev. D56 (1997) 5431-5451

Physics

High Energy Physics

High Energy Physics - Phenomenology

46 pages, LaTeX, 4 encapsulated figures included

Scientific paper

10.1103/PhysRevD.56.5431

We analyze the scenario of baryogenesis through leptogenesis induced by the out-of-equilibrium decays of heavy Majorana neutrinos and pay special attention to CP violation. Extending a recently proposed resummation formalism for two-fermion mixing to decay amplitudes, we calculate the resonant phenomenon of CP violation due to the mixing of two nearly degenerate heavy Majorana neutrinos. Solving numerically the relevant Boltzmann equations, we find that the isosinglet Majorana mass may range from 1 TeV up to the grand unification scale, depending on the mechanism of CP violation and/or the flavour structure of the neutrino mass matrix assumed. Finite temperature effects and possible constraints from the electric dipole moment of electron and other low-energy experiments are briefly discussed.

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