The LZ inelastic splitting as a probe of anomaly mediation
Abstract
The LZ 248 keV recoil candidate admits an interpretation in terms of pseudo-Dirac dark matter with a mixing-suppressed inelastic Z interaction. In the MSSM, the Higgsino limit conflicts with the adopted solar-neutrino bound, while a gaugino realization requires an unprotected mass degeneracy. We realize such spectra in the MRSSM, where an R-symmetric Dirac bino produces the required Z transition and wino coannihilation supplies the observed relic abundance. We impose the Higgs and gauge coupling relations of N=2 supersymmetry at a high scale and evolve them to low energy. With the remaining model parameters held fixed, we obtain spectra spanning roughly 300-850 GeV that satisfy the adopted constraints and have a small diagonal axial current. If anomaly mediation dominates the Majorana splitting, its local scale is tens of MeV for splittings of a few hundred keV. A five-dimensional warped construction generates this scale through Goldberger-Wise stabilization and a loop correction to the no-scale Kähler potential. The spectra remain testable through elastic scattering, solar neutrinos and long-lived charged states.
Related
- Environment-dependent mass splitting to suppress solar capture in the inelastic-doublet interpretation of the LZ event
- Kaluza--Klein Dark-Photon Mediation of Inelastic Dark Matter at LUX-ZEPLIN
- Signatures of bi-altermagnetism revealed by sublattice-specific circular dichroism in resonant inelastic X-ray scattering
- Direct observation of the Lindhard continuum using resonant inelastic X-ray scattering
- Direct detection constraints on EFT operators for inelastic dark matter
BibTeX
@misc{lee2026inelastic,
title = {{The LZ inelastic splitting as a probe of anomaly mediation}},
author = {Seung J. Lee and Taewook Youn},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13930},
eprint = {2610.13930},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13930},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The LZ inelastic splitting as a probe of anomaly mediation
AU - Seung J. Lee
AU - Taewook Youn
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13930
UR - https://arxiv.org/abs/2610.13930
AB - The LZ 248 keV recoil candidate admits an interpretation in terms of pseudo-Dirac dark matter with a mixing-suppressed inelastic Z interaction. In the MSSM, the Higgsino limit conflicts with the adopted solar-neutrino bound, while a gaugino realization requires an unprotected mass degeneracy. We realize such spectra in the MRSSM, where an R-symmetric Dirac bino produces the required Z transition and wino coannihilation supplies the observed relic abundance. We impose the Higgs and gauge coupling relations of N=2 supersymmetry at a high scale and evolve them to low energy. With the remaining model parameters held fixed, we obtain spectra spanning roughly 300-850 GeV that satisfy the adopted constraints and have a small diagonal axial current. If anomaly mediation dominates the Majorana splitting, its local scale is tens of MeV for splittings of a few hundred keV. A five-dimensional warped construction generates this scale through Goldberger-Wise stabilization and a loop correction to the no-scale Kähler potential. The spectra remain testable through elastic scattering, solar neutrinos and long-lived charged states.
ER -