TY  - JOUR
AU  - Di Bari, P.
AU  - Ludl, P. O.
AU  - Palomares-Ruiz, S.
PY  - 2016
DA  - 2016//
TI  - Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 044
EP  - 41pp
VL  - 11
IS  - 11
PB  - Iop Publishing Ltd
KW  - dark matter theory
KW  - leptogenesis
KW  - physics of the early universe
KW  - ultra high energy photons and neutrinos
AB  - We revisit a model in which neutrino masses and mixing are described by a two right-handed (RH) neutrino seesaw scenario, implying a strictly hierarchical light neutrino spectrum. A third decoupled RH neutrino, N-DM with mass M-DM, plays the role of cold dark matter (DM) and is produced by the mixing with a source RH neutrino, Ns with mass M-S, induced by Higgs portal interactions. The same interactions are also responsible for N-DM decays. We discuss in detail the constraints coming from DM abundance and stability conditions showing that in the hierarchical case, for M-DM >> M-S, there is an allowed window on M-DM values necessarily implying a contribution, from DM decays, to the high-energy neutrino flux recently detected by IceCube. We also show how the model can explain the matter-antimatter asymmetry of the Universe via leptogenesis in the quasi-degenerate limit. In this case, the DM mass should be within the range 300 GeV less than or similar to M-S < M-DM < 10PeV. We discuss the specific properties of this high-energy neutrino flux and show the predicted event spectrum for two exemplary cases. Although DM decays, with a relatively hard spectrum, cannot account for all the IceCube high-energy data, we illustrate how this extra source of high-energy neutrinos could reasonably explain some potential features in the observed spectrum. In this way, this represents a unified scenario for leptogenesis and DM that could be tested during the next years with more high-energy neutrino events.
SN  - 1475-7516
UR  - http://arxiv.org/abs/1606.06238
UR  - https://doi.org/10.1088/1475-7516/2016/11/044
DO  - 10.1088/1475-7516/2016/11/044
LA  - English
N1  - WOS:000397734100044
ID  - DiBari_etal2016
ER  -