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Probing right-handed neutrinos dipole operators
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abstract
We consider the minimal see-saw extension of the Standard Model with two right-handed singlet fermions $N_{1,2}$ with mass at the GeV scale, augmented by an effective dipole operator between the sterile states. We firstly review current bounds on this effective interaction from fixed-target and collider experiments as well as from astrophysical and cosmological observations. We then highlight the prospects for testing the decay $N_2 \to N_1 \gamma$ induced by the dipole at future facilities targeting long lived particles such as ANUBIS, CODEX-b, FACET, FASER 2, MAPP and SHiP.
Forward citations
Cited by 3 Pith papers
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Resonant electromagnetic leptogenesis with coherent heavy-neutrino evolution
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Long-lived heavy neutral leptons produced via top-quark effective operators could be probed at the HL-LHC up to new-physics scales around 12 TeV at ATLAS and 4.5 TeV at MATHUSLA or ANUBIS.
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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 implica...
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