PT Journal
AU Racker, J
   Rius, N
TI Helicitogenesis: WIMPy baryogenesis with sterile neutrinos and other realizations
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2014
BP 163
EP 19pp
VL 11
IS 11
DI 10.1007/JHEP11(2014)163
LA English
DE Cosmology of Theories beyond the SM; Beyond Standard Model
AB We propose a mechanism for baryogenesis from particle decays or annihilations that can work at the TeV scale. Some heavy particles annihilate or decay into a heavy sterile neutrino N (with M greater than or similar to 0.5 TeV) and a "light" one nu (with m << 100 GeV), generating an asymmetry among the two helicity degrees of freedom of nu. This asymmetry is partially transferred to Standard Model leptons via fast Yukawa interactions and reprocessed into a baryon asymmetry by the electroweak sphalerons. We illustrate this mechanism in a WIMPy baryogenesis model where the helicity asymmetry is generated in the annihilation of dark matter. This model connects the baryon asymmetry, dark matter, and neutrino masses. Moreover it also complements previous studies on general requirements for baryogenesis from dark matter annihilation. Finally we discuss other possible realizations of this helicitogenesis mechanism.
ER