A leptogenesis model generates the baryon asymmetry at the TeV scale through two-body decays of heavy right-handed neutrinos to lighter sterile neutrinos via a dimension-5 electromagnetic dipole operator, with implications for sterile neutrino dark matter and Neff.
Illuminating the dark: mono-$\gamma$ signals at NA62
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abstract
Dipole interactions between dark sector states or between a Standard Model particle and a dark state can efficiently be searched for via high-intensity fixed-target facilities. We propose to look for the associated mono-$\gamma$ signature at the NA62 experiment running in beam dump mode. Focusing on models of dipole inelastic Dark Matter and active-sterile neutrino dipole interactions, we compute the corresponding expected sensitivities finding promising prospects for discovery already with $\sim10^{17}$ proton-on-target, corresponding to the present accumulated dataset.
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Electromagnetic leptogenesis with light-heavy sterile neutrinos
A leptogenesis model generates the baryon asymmetry at the TeV scale through two-body decays of heavy right-handed neutrinos to lighter sterile neutrinos via a dimension-5 electromagnetic dipole operator, with implications for sterile neutrino dark matter and Neff.