4.4 Article

Helicitogenesis: WIMPy baryogenesis with sterile neutrinos and other realizations

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 11, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP11(2014)163

Keywords

Cosmology of Theories beyond the SM; Beyond Standard Model

Funding

  1. Spanish MINECO Subprogramme Juan de la Cierva
  2. Spanish MINECO [FPA2011-29678-C02-01]
  3. Consolider-Ingenio CUP [CSD2008-00037]
  4. Generalitat Valenciana grant [PROMETEO/2009/116]
  5. European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PITN-GA-2011-289442]

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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 0.5TeV) 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.

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