Confronting the Higgsino Interpretation of the LZ Event with Astrophysical Uncertainties and the Solar Capture Constraints
Abstract
We investigate whether astrophysical uncertainties in the local dark matter distribution can alleviate tensions between the higgsino interpretation of the LZ event and constraints from solar-capture neutrinos. We calculate the expected LZ signal over a wide range of Standard Halo Model parameters and using N-body hydrodynamical simulations of Milky Way-like galaxies that include the influence of the Large Magellanic Cloud. For the Standard Halo Model, the requirement δ≳ 566 keV implies v0 ≳ 240 km s−1, independent of the Galactic escape speed. In the simulated halo, we find that δ= 514 keV is the largest mass splitting capable of producing one event in LZ's 200 keV−300 keV recoil-energy range. We conclude that astrophysical uncertainties are insufficient to reconcile the higgsino interpretation of the LZ event with solar-capture neutrino constraints.
Related
- Confronting the Higgsino Interpretation of the LZ Event with the High-Energy Sideband
- Higgsino Dark Matter Interpretation of the LUX-ZEPLIN 248 keV Nuclear-Recoil Event
- Learning Astrophysical Uncertainties in Dark Matter Direct Detection with Simulation-Based Inference
- TeV Higgsino Interpretation of the LZ High-Recoil Event with Intermediate-Scale Electroweak Gauginos
- Higgsino Dark Matter Interpretation of the LZ High-Recoil Event in the GNMSSM with TeV-Scale Gauginos
BibTeX
@misc{ghosh2026confronting,
title = {{Confronting the Higgsino Interpretation of the LZ Event with Astrophysical Uncertainties and the Solar Capture Constraints}},
author = {Aditya Ghosh and Ilumi Chavez and Chris Kelso},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.15321},
eprint = {2609.15321},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15321},
}
RIS
TY - UNPB
TI - Confronting the Higgsino Interpretation of the LZ Event with Astrophysical Uncertainties and the Solar Capture Constraints
AU - Aditya Ghosh
AU - Ilumi Chavez
AU - Chris Kelso
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.15321
UR - https://arxiv.org/abs/2609.15321
AB - We investigate whether astrophysical uncertainties in the local dark matter distribution can alleviate tensions between the higgsino interpretation of the LZ event and constraints from solar-capture neutrinos. We calculate the expected LZ signal over a wide range of Standard Halo Model parameters and using N-body hydrodynamical simulations of Milky Way-like galaxies that include the influence of the Large Magellanic Cloud. For the Standard Halo Model, the requirement δ≳ 566 keV implies v_0 ≳ 240 km s^−1, independent of the Galactic escape speed. In the simulated halo, we find that δ= 514 keV is the largest mass splitting capable of producing one event in LZ's 200 keV−300 keV recoil-energy range. We conclude that astrophysical uncertainties are insufficient to reconcile the higgsino interpretation of the LZ event with solar-capture neutrino constraints.
ER -