One Event, Two Frontiers: From LZ to LHC
Abstract
The 248 keV nuclear-recoil event observed by the LUX-ZEPLIN (LZ) experiment could potentially arise from dark matter (DM) interactions with nucleons. We investigate elastic scattering interpretation, focusing on Lagrangians that yield a local significance of 3σ or higher for some DM mass. We identify DM parameter space compatible with the LZ event and assess its consistency with collider constraints by recasting the ATLAS monojet plus missing-transverse-momentum search at √s=13 TeV, based on 139 fb−1 of data. For most of the effective interactions, we find that LHC constraints exclude the DM interpretation of the LZ event for DM masses below ≲TeV subject to the effective field theory (EFT) validity. In particular, we derive, for the first time, LHC constraints on several explicit momentum-dependent Lagrangians, including ℒ10. For many interactions, these constraints are sufficiently strong that the corresponding parameter space below DM mass ≲TeV may be challenging to probe even with future direct detection experiments. Our results, therefore, have broader implications beyond the interpretation of the LZ event itself.
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BibTeX
@misc{anwar2026event,
title = {{One Event, Two Frontiers: From LZ to LHC}},
author = {Md Sadique Anwar and Nivedita Ghosh and Sahabub Jahedi and Tarak Nath Maity},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.06756},
eprint = {2610.06756},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.06756},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - One Event, Two Frontiers: From LZ to LHC
AU - Md Sadique Anwar
AU - Nivedita Ghosh
AU - Sahabub Jahedi
AU - Tarak Nath Maity
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.06756
UR - https://arxiv.org/abs/2610.06756
AB - The 248 keV nuclear-recoil event observed by the LUX-ZEPLIN (LZ) experiment could potentially arise from dark matter (DM) interactions with nucleons. We investigate elastic scattering interpretation, focusing on Lagrangians that yield a local significance of 3σ or higher for some DM mass. We identify DM parameter space compatible with the LZ event and assess its consistency with collider constraints by recasting the ATLAS monojet plus missing-transverse-momentum search at √s=13 TeV, based on 139 fb^−1 of data. For most of the effective interactions, we find that LHC constraints exclude the DM interpretation of the LZ event for DM masses below ≲TeV subject to the effective field theory (EFT) validity. In particular, we derive, for the first time, LHC constraints on several explicit momentum-dependent Lagrangians, including ℒ_10. For many interactions, these constraints are sufficiently strong that the corresponding parameter space below DM mass ≲TeV may be challenging to probe even with future direct detection experiments. Our results, therefore, have broader implications beyond the interpretation of the LZ event itself.
ER -