Quantum Zeno effect and the impact of flavor in leptogenesis

Details Quantum Zeno effect and the impact of flavor in leptogenesis Quantum Zeno effect and the impact of flavor in leptogenesis

2006-11-28

arxiv.org/abs/hep-ph/0611337v1

JCAP 0703:012,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

10.1088/1475-7516/2007/03/012

In thermal leptogenesis, the cosmic matter-antimatter asymmetry is produced by CP violation in the decays N --> l + \Phi of heavy right-handed Majorana neutrinos N into ordinary leptons l and Higgs particles \Phi. If some charged-lepton Yukawa couplings are in equilibrium during the leptogenesis epoch, the l interactions with the background medium are flavor sensitive and the coherence of their flavor content defined by N --> l+\Phi is destroyed, modifying the efficiency of the inverse decays. We point out, however, that it is not enough that the flavor-sensitive processes are fast on the cosmic expansion time scale, they must be fast relative to the N <--> l +\Phi reactions lest the flavor amplitudes of l remain frozen by the repeated N <--> l+\Phi ``measurements''. Our more restrictive requirement is significant in the most interesting ``strong wash-out case'' where N <--> l +\Phi is fast relative to the cosmic expansion rate. We derive conditions for the unflavored treatment to be adequate and for flavor effects to be maximal. In this ``fully flavored regime'' a neutrino mass bound survives. To decide if this bound can be circumvented in the intermediate case, a full quantum kinetic treatment is required.

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