Neutrino Transition Polarizability
Abstract
We study Neutrino Transition Polarizability, where a light pseudoscalar ϕ couples active neutrinos to heavy neutral leptons N and interacts with two photons. We consider an effective description of the active - sterile interaction, and a realization within the inverse seesaw mechanism; the coupling to photons is generated by heavy charged states. For mN>mϕ, the decay N→νϕ can greatly shorten the heavy neutrino lifetime, while ϕ→γγ produces a displaced photon pair. This changes the relevant search strategies, favoring production and decay inside detectors. We discuss existing constraints and estimate the sensitivity of displaced photon searches at DUNE, Belle II, LHCb and FCC-ee, highlighting the complementarity of neutrino scattering and meson and electroweak boson decays.
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BibTeX
@misc{borrello2026neutrino,
title = {{Neutrino Transition Polarizability}},
author = {Matteo Borrello and Michele Tammaro},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.30252},
eprint = {2610.30252},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.30252},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Neutrino Transition Polarizability
AU - Matteo Borrello
AU - Michele Tammaro
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.30252
UR - https://arxiv.org/abs/2610.30252
AB - We study Neutrino Transition Polarizability, where a light pseudoscalar ϕ couples active neutrinos to heavy neutral leptons N and interacts with two photons. We consider an effective description of the active - sterile interaction, and a realization within the inverse seesaw mechanism; the coupling to photons is generated by heavy charged states. For m_N>m_ϕ, the decay N→νϕ can greatly shorten the heavy neutrino lifetime, while ϕ→γγ produces a displaced photon pair. This changes the relevant search strategies, favoring production and decay inside detectors. We discuss existing constraints and estimate the sensitivity of displaced photon searches at DUNE, Belle II, LHCb and FCC-ee, highlighting the complementarity of neutrino scattering and meson and electroweak boson decays.
ER -