Baryogenesis through mixing of heavy Majorana neutrinos
Abstract
Description
We review the scenario of baryogenesis through leptogenesis induced by the out-of-equilibrium decays of heavy neutrinos. We pay special attention to the resonant phenomenon of CP violation through mixing of two nearly degenerate heavy Majorana neutrinos and show how unitarity and CPT invariance is maintained within the resummation approach. An important consequence of this is that the leptogenesis scale may be as low as 1 TeV, even for models with universal Yukawa couplings. We briefly discuss the impact of finite temperature effects and low-energy constraints to the afore-mentioned mechanism of CP violation.
16 pages, uses axodraw.sty and iopconf1.sty, two encapsulated figures. To appear in the proceedings of 2nd International Conference on Dark Matter in Astro and Particle Physics (DARK98), ed. H.V. Klapdor-Kleingrothaus, Heidelberg, Germany, 20-25 July 1998. Related talks were given at SLAC (21.08.1998), FERMILAB (27.08.1998) and ICTP (16.09.1998)
16 pages, uses axodraw.sty and iopconf1.sty, two encapsulated figures. To appear in the proceedings of 2nd International Conference on Dark Matter in Astro and Particle Physics (DARK98), ed. H.V. Klapdor-Kleingrothaus, Heidelberg, Germany, 20-25 July 1998. Related talks were given at SLAC (21.08.1998), FERMILAB (27.08.1998) and ICTP (16.09.1998)