Lowering the scale of fermion triplet leptogenesis with two Higgs doublets

Abstract

In this paper, we consider the possibility of generating the observed baryon asymmetry of the Universe via leptogenesis in the context of triplet fermion mediated type-III seesaw model of neutrino mass. With a hierarchical spectrum of the additional fermions, the lower bound on the lightest triplet mass is $\sim 10^{10}\mathrm{GeV}$ for successful leptogenesis, a couple of orders higher than that of the type-I case. We investigate the possibility of lowering this bound in the framework of two-Higgs-doublet models. We find that the bounds can be lowered down to $10^7$ GeV for a hierarchical spectrum. If we include the flavor effects, then a further lowering by one order of magnitude is possible. We also discuss if such lowering can be compatible with the naturalness bounds on the triplet mass.

9 pages, 7 figures; v2: Published version

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Cited by in corpus (7)

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• The Two Scales of New Physics in Higgs Couplings
• Asymmetric long-lived dark matter and leptogenesis from type-III seesaw framework
• Reviewing the prospect of fermion triplets as dark matter and source of baryon asymmetry in non-standard cosmology
• TeV Scale Resonant Leptogenesis with triplet Fermion in Connection to Muon $g-2$
• Probing leptogenesis and the minimal neutrino seesaw mechanism through gravitational waves