Probing Leptogenesis

E.J. Chun , G. Cvetič , P.S.B. Dev , M. Drewes , C.S. Fong , B. Garbrecht , T. Hambye , J. Harz (1, 2) , P. Hernández , C.S. Kim , E. Molinaro , E. Nardi , J. Racker , N. Rius , J. Zamora-Saa

1 Institut Lagrange de Paris
2 LPTHE - Laboratoire de Physique Théorique et Hautes Energies

The focus of this paper lies on the possible experimental tests of leptogenesis scenarios. We consider both leptogenesis generated from oscillations, as well as leptogenesis from out-of-equilibrium decays. As the Akhmedov–Rubakov–Smirnov (ARS) mechanism allows for heavy neutrinos in the GeV range, this opens up a plethora of possible experimental tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches for neutral heavy leptons at future facilities. In contrast, testing leptogenesis from out-of-equilibrium decays is a quite difficult task. We comment on the necessary conditions for having successful leptogenesis at the TeV-scale. We further discuss possible realizations and their model specific testability in extended seesaw models, models with extended gauge sectors, and supersymmetric leptogenesis. Not being able to test high-scale leptogenesis directly, we present a way to falsify such scenarios by focusing on their washout processes. This is discussed specifically for the left–right symmetric model and the observation of a heavy WR, as well as model independently when measuring ΔL = 2 washout processes at the LHC or neutrinoless double beta decay.

Mots clés: 13.15.+g; 14.60.St; 12.60.Cn; 12.60.Jv; Neutrino interactions; nonstandard-model neutrinos; right-handed neutrinos; extensions of electroweak gauge sector; supersymmetric models; double-beta decay: (0neutrino); neutrino: right-handed; neutrino: interaction; neutrino: oscillation; neutrino: heavy; hadron: decay; lepton: flavor: violation; lepton number: violation; leptogenesis; supersymmetry; electroweak interaction; interpretation of experiments: CERN LHC Coll; heavy lepton; seesaw model; left-right

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

E.J. Chun, G. Cvetič, P.S.B. Dev, M. Drewes, C.S. Fong, et al.. Probing Leptogenesis. International Journal of Modern Physics A, 2018, 33 (05n06), pp.1842005. ⟨10.1142/S0217751X18420058⟩. ⟨hal-01730080⟩