Pseudo-Dirac Inelastic Dark Matter in the Leptophobic U(1)B Model: Confronting the LUX-ZEPLIN High-Recoil Event with Collider Searches
Abstract
Interpreting the $248$~keV nuclear-recoil candidate reported by LUX-ZEPLIN (LZ) as an endothermic transition needs two ingredients usually put in by hand: a stable dark state, and a coherent current that is purely off diagonal. Gauging baryon number supplies both. For the minimal dark charges B(χL)=−3/2 and B(χR)=−9/2, the scalars that generate the dark masses leave an exact residual parity P=(−1)6B stabilizing the lightest state, while the same Majorana masses make the vector current transition dominated as an identity rather than a choice. At mχ=1~TeV and δ=300~keV the model is over-determined: the observed LZ interval, a leading-order relic estimate and the LHC dijet limit meet at the single perturbatively acceptable point (MZB,gB)≃(1.44 TeV,0.233). That point is allowed by currently existing searches but sits just below the trigger-level dijet boundary, so it is alive and not yet decided--and a re-run of that analysis on the Run-3 data at √s=13.6~TeV, already on tape, will exclude it or find it. Nor is the interpretation confined to that splitting: at δ=200~keV, the same construction predicts a heavier mediator at comparable coupling, MZB≃2.4-$3.0$~TeV with gB≃0.15-$0.34$, a range the HL-LHC dijet program will probe.
Related
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- Confronting the Higgsino Interpretation of the LZ Event with Astrophysical Uncertainties and the Solar Capture Constraints
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BibTeX
@misc{du2026pseudodirac,
title = {{Pseudo-Dirac Inelastic Dark Matter in the Leptophobic $U(1)_B$ Model: Confronting the LUX-ZEPLIN High-Recoil Event with Collider Searches}},
author = {Xin-Yu Du and Wenjie Huang and Keping Xie},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.07225},
eprint = {2609.07225},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07225},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Pseudo-Dirac Inelastic Dark Matter in the Leptophobic U(1)_B Model: Confronting the LUX-ZEPLIN High-Recoil Event with Collider Searches
AU - Xin-Yu Du
AU - Wenjie Huang
AU - Keping Xie
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2609.07225
UR - https://arxiv.org/abs/2609.07225
AB - Interpreting the $248$~keV nuclear-recoil candidate reported by LUX-ZEPLIN (LZ) as an endothermic transition needs two ingredients usually put in by hand: a stable dark state, and a coherent current that is purely off diagonal. Gauging baryon number supplies both. For the minimal dark charges B(χ_L)=−3/2 and B(χ_R)=−9/2, the scalars that generate the dark masses leave an exact residual parity P=(−1)^6B stabilizing the lightest state, while the same Majorana masses make the vector current transition dominated as an identity rather than a choice. At m_χ=1~TeV and δ=300~keV the model is over-determined: the observed LZ interval, a leading-order relic estimate and the LHC dijet limit meet at the single perturbatively acceptable point (M_Z_B,g_B)≃(1.44 TeV,0.233). That point is allowed by currently existing searches but sits just below the trigger-level dijet boundary, so it is alive and not yet decided--and a re-run of that analysis on the Run-3 data at √s=13.6~TeV, already on tape, will exclude it or find it. Nor is the interpretation confined to that splitting: at δ=200~keV, the same construction predicts a heavier mediator at comparable coupling, M_Z_B≃2.4-$3.0$~TeV with g_B≃0.15-$0.34$, a range the HL-LHC dijet program will probe.
SN - 2331-8422
ER -