Neutrino masses and mixings; Dark matter; Collider phenomenology
Abstract :
[en] Extending the standard model with three right-handed neutrinos (Nk) and a second Higgs doublet (η), odd under the discrete parity symmetry Z2, Majorana neutrino masses can be generated at one-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 (M1≪M2<M3<mη) 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 ~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 flavor 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→eγ).
Disciplines :
Physics
Author, co-author :
Aristizabal Sierra, Diego ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Kubo, Jisuke
Restrepo, D.
Suematsu, Daijiro
Zapata, Oscar
Language :
English
Title :
Radiative seesaw: Warm dark matter, collider and lepton flavour violating signals
Publication date :
January 2009
Journal title :
Physical Review. D, Particles, Fields, Gravitation, and Cosmology
ISSN :
1550-7998
eISSN :
1550-2368
Publisher :
American Physical Society, College Park, United States - Maryland
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