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Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches

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arxiv 2405.08877 v2 pith:PVV4NB4D submitted 2024-05-14 hep-ph

classification hep-ph
keywords momentssearchesdipolemagneticsterilemodelneutrinosprobe
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We explore long-lived particle (LLP) searches using non-pointing photons at the LHC as a probe for sterile-to-sterile and active-to-sterile transition magnetic dipole moments of sterile neutrinos. We consider heavy sterile neutrinos with masses ranging from a few~GeV to several hundreds of GeV. We discuss transition magnetic dipole moments using the Standard Model effective field theory and low-energy effective field theory extended by sterile neutrinos ($N_R$SMEFT and $N_R$LEFT) and also provide a simplified UV-complete model example. LLP searches at the LHC using non-pointing photons will probe sterile-to-sterile dipole moments two orders of magnitude below the current best constraints from LEP, while an unprecedented sensitivity to sterile neutrino mass of about 700 GeV is expected for active-to-sterile dipole moments. For the UV model example with one-loop transition magnetic moments, the searches for charged lepton flavour violating processes in synergy with LLP searches at the LHC can probe new physics at several TeV mass scales and provide valuable insights into the lepton flavour structure of new physics couplings.

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Heavy neutral leptons and top quarks in effective field theory

    hep-ph 2025-01 conditional novelty 6.0 of 10

    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.

  2. Simulations of the Sterile Neutrino Oscillations with a Crossing-Width Term

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A two-step diagonalization plus a dummy-particle trick lets standard event generators simulate GeV-scale sterile neutrino oscillations with crossing-width terms, and a QFT derivation gives displaced-vertex distances.

  3. New Physics at the Muon (Synchrotron) Ion Collider: MuSIC for several scales

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A TeV-scale muon-ion collider (MuSIC) could probe new physics in four BSM scenarios with reach surpassing the HL-LHC and other future facilities.

  4. Bounds on decaying sterile neutrinos via magnetic dipole moment from COB intensity

    astro-ph.CO 2025-02 reject novelty 4.0 of 10

    The paper derives a range of sterile neutrino masses and transition magnetic moments that would reproduce the LORRI cosmic optical background excess, but the excess is only a 1.5-sigma signal.

  5. The Forward Neutrino Flux and its Secondaries at a 10 TeV Muon Collider

    hep-ph 2026-08

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