%0 Journal Article
%T Sterile neutrino dark matter and low scale leptogenesis from a charged scalar.
%+ Laboratoire Charles Coulomb (L2C)
%A Frigerio, Michele
%A Yaguna, Carlos E
%Z 15 pages
%< avec comité de lecture
%Z L2C:14-141
%@ 1434-6044
%J European Physical Journal C: Particles and Fields
%I Springer Verlag (Germany)
%V 75
%N 1
%P 31
%8 2015-01-27
%D 2015
%Z 1409.0659
%R 10.1140/epjc/s10052-014-3252-1
%M 25983647
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Journal articles
%X We show that novel paths to dark matter generation and baryogenesis are open when the Standard Model is extended with three sterile neutrinos $N_i$ and a charged scalar $\delta^+$. Specifically, we propose a new production mechanism for the dark matter particle --a multi-keV sterile neutrino, $N_1$-- that does not depend on the active-sterile mixing angle and does not rely on a large primordial lepton asymmetry. Instead, $N_1$ is produced, via freeze-in, by the decays of $\delta^+$ while it is in equilibrium in the early Universe. In addition, we demonstrate that, thanks to the couplings between the heavier sterile neutrinos $N_{2,3}$ and $\delta^+$, baryogenesis via leptogenesis can be realized close to the electroweak scale. The lepton asymmetry is generated either by $N_{2,3}$-decays for masses $M_{2,3}\gtrsim$ TeV, or by $N_{2,3}$-oscillations for $M_{2,3}\sim$ GeV. Experimental signatures of this scenario include an X-ray line from dark matter decays, and the direct production of $\delta^+$ at the LHC. This model thus describes a minimal, testable scenario for neutrino masses, the baryon asymmetry, and dark matter.
%G English
%2 https://hal.science/hal-01060212/document
%2 https://hal.science/hal-01060212/file/1409.0659.pdf
%L hal-01060212
%U https://hal.science/hal-01060212
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ ANR
%~ UM-2015-2021