Quantum Resonant Leptogenesis and Minimal Lepton Flavour Violation

Details Quantum Resonant Leptogenesis and Minimal Lepton Flavour Violation Quantum Resonant Leptogenesis and Minimal Lepton Flavour Violation

2007-11-05

arxiv.org/abs/0711.0778v1

JCAP 0801:004,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 7 figures

Scientific paper

10.1088/1475-7516/2008/01/004

It has been recently shown that the quantum Boltzmann equations may be relevant for the leptogenesis scenario. In particular, they lead to a time-dependent CP asymmetry which depends upon the previous dynamics of the system. This memory effect in the CP asymmetry is particularly important in resonant leptogenesis where the asymmetry is generated by the decays of nearly mass-degenerate right-handed neutrinos. We study the impact of the non-trivial time evolution of the CP asymmetry in the so-called Minimal Lepton Flavour Violation framework where the charged-lepton and the neutrino Yukawa couplings are the only irreducible sources of lepton-flavour symmetry breaking and resonant leptogenesis is achieved. We show that significant quantitative differences arise with respect to the case in which the time dependence of the CP asymmetry is neglected.

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