Radiative seesaw: Warm dark matter, collider and lepton flavour violating signals

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dc.creatorSierra, D. Aristizabal
dc.creatorKubo, Jisuke
dc.creatorRestrepo, D.
dc.creatorSuematsu, Daijiro
dc.creatorZapata, Oscar
dc.date2008-08-25
dc.date2009-01-29
dc.date.accessioned2026-07-07T12:39:09Z
dc.date.available2026-07-07T12:39:09Z
dc.descriptionExtending the standard model with three right-handed neutrinos ($N_k$) and a second Higgs doublet ($η$), odd under the discrete parity symmetry $Z_2$, Majorana neutrino masses can be generated at 1-loop order. In the resulting model, the lightest stable particle, either a boson or a fermion, might be a dark matter candidate. Here we assume a specific mass spectrum ($M_1\ll M_2 < M_3 < m_η$) and derive its consequences for dark matter and collider phenomenology. We show that (i) the lightest right-handed neutrino is a warm dark matter particle that can give a $\sim$10% contribution to the dark matter density; (ii) several decay branching ratios of the charged scalar can be predicted from measured neutrino data. Especially interesting is that large lepton flavour violating rates in muon and tau final states are expected. Finally, we derive upper bounds on the right-handed neutrino Yukawa couplings from the current experimental limit on $Br(μ\to eγ)$.
dc.description25 pages, 7 figures. A few clarifications and references added, collider physics improved, conclusions unchanged. Version matches publication in PRD (Title changed in journal)
dc.identifierhttps://arxiv.org/abs/0808.3340
dc.identifierhttp://arxiv.org/abs/0808.3340
dc.identifierPhys.Rev.D79:013011,2009
dc.identifierdoi:10.1103/PhysRevD.79.013011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219010
dc.subjectHigh Energy Physics - Phenomenology
dc.titleRadiative seesaw: Warm dark matter, collider and lepton flavour violating signals
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