Triplet Leptogenesis in Left-Right Symmetric Seesaw Models

Details Triplet Leptogenesis in Left-Right Symmetric Seesaw Models Triplet Leptogenesis in Left-Right Symmetric Seesaw Models

2007-10-12

arxiv.org/abs/0710.2408v2

JCAP0801:014,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures, published version

Scientific paper

10.1088/1475-7516/2008/01/014

We discuss scalar triplet leptogenesis in a specific left-right symmetric seesaw model. We show that the Majorana phases that are present in the model can be effectively used to saturate the existing upper limit on the CP-asymmetry of the triplets. We solve the relevant Boltzmann equations and analyze the viability of triplet leptogenesis. It is known for this kind of scenario that the efficiency of leptogenesis is maximal if there exists a hierarchy between the branching ratios of the triplet decays into leptons and Higgs particles. We show that triplet leptogenesis typically favors branching ratios with not too strong hierarchies, since maximal efficiency can only be obtained at the expense of suppressed CP-asymmetries.

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