Probing right-handed neutrinos dipole operators

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.

24 pages, 3 figures, matches published version

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Cited by in corpus (14)

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• Study of sub-GeV Dipolar Dark States at SND@LHC within Invisible Bounds on Meson Decays