Long-lived neutral fermions at the DUNE near detector

Abstract

At the Deep Underground Neutrino Experiment (DUNE), a proton beam hits a fixed target leading to large production rates of mesons. These mesons can decay and potentially provide a source of long-lived neutral fermions. Examples of such long-lived fermions are heavy neutral leptons which can mix with the standard-model active neutrinos, and the bino-like lightest neutralino in R-parity-violating supersymmetry. We show that the Standard Model Effective Field Theory extended with right-handed singlet neutrinos can simultaneously describe heavy neutral leptons and bino-like neutralinos in a unified manner. We use the effective-field-theory framework to determine the sensitivity reach of the DUNE near detector in probing various scenarios of long-lived neutral fermions.

v1, 44 pages plus references, 9 figures, 21 tables; v2, minor changes, accepted for publication in JHEP

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• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Two portals to GeV sterile neutrinos : dipole versus mixing
• Searching for long-lived light neutralinos and axionlike particles at the SHiNESS experiment
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee