We consider the minimal see-saw extension of the Standard Model with two right-handed singlet fermions N-1,N-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 -> 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.
Probing right-handed neutrinos dipole operators / Barducci, Daniele; Bertuzzo, Enrico; Taoso, Marco; Toni, Claudio. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:3(2023), pp. 1-30. [10.1007/jhep03(2023)239]
Probing right-handed neutrinos dipole operators
Enrico Bertuzzo;
2023
Abstract
We consider the minimal see-saw extension of the Standard Model with two right-handed singlet fermions N-1,N-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 -> 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.
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