Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-01-18
Phys.Rev. D60 (1999) 016005
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 9 figures, using Latex and epsfig
Scientific paper
10.1103/PhysRevD.60.016005
We present a mechanism of leptogenesis based on the out-of-equilibrium decay of a scalar particle into heavy virtual Majorana neutrinos. This scheme presents many conceptual advantages over the conventional scenario of Fukugita and Yanagida. In particular, the standard techniques of quantum field theory can be used to compute the lepton asymmetry, without resorting to the phenomenological approximations usually made to describe unstable particles. This simplification allows us to address in a well-defined framework some issues raised in the recent literature. We also show, in a toy model, that a successful leptogenesis scenario is possible and requires a rather light scalar particle, $10^6 GeV < m < 10^{13} GeV$. A natural embedding of this scheme in a gauged unified theory encompassing the Majorana fermions seems however difficult.
Frere Jean-Marie
Ling F.-S.
Tytgat Michel H. G.
Van Elewyck Veronique
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