Taming lepton portal dark matter by a non-invertible selection rule
Abstract
We point out that a non-invertible selection rule can control the flavor violation inherent in lepton portal dark matter, a weakly interacting massive particle candidate that can evade severe constraints from direct detection experiments. We show that ordinary invertible symmetries cannot suppress flavor-violating portal couplings while accommodating the large mixing angles in the PMNS matrix. We then present a simple construction based on the ℤ2 gauging of a ℤ5 symmetry, which realizes one-flavor dominance of the portal couplings consistently with the PMNS mixing matrix. We also discuss possible flavor leakage in a type-I seesaw completion and study experimental probes of the model through lepton observables, especially lepton flavor non-universality in Z boson decays.
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BibTeX
@misc{kawamura2026taming,
title = {{Taming lepton portal dark matter by a non-invertible selection rule}},
author = {Junichiro Kawamura},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29051},
eprint = {2608.29051},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29051},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Taming lepton portal dark matter by a non-invertible selection rule
AU - Junichiro Kawamura
PY - 2026
DA - 2026/08/29
PB - arXiv
DO - 10.48550/arxiv.2608.29051
UR - https://arxiv.org/abs/2608.29051
AB - We point out that a non-invertible selection rule can control the flavor violation inherent in lepton portal dark matter, a weakly interacting massive particle candidate that can evade severe constraints from direct detection experiments. We show that ordinary invertible symmetries cannot suppress flavor-violating portal couplings while accommodating the large mixing angles in the PMNS matrix. We then present a simple construction based on the ℤ_2 gauging of a ℤ_5 symmetry, which realizes one-flavor dominance of the portal couplings consistently with the PMNS mixing matrix. We also discuss possible flavor leakage in a type-I seesaw completion and study experimental probes of the model through lepton observables, especially lepton flavor non-universality in Z boson decays.
ER -