The compressed bino--wino dark matter in the GmSUGRA and the LHC soft-lepton searches
Abstract
The search for electroweak supersymmetric particles remains an important part of the LHC program since neutralinos and charginos with masses around a few hundred GeV are still compatible with the present constraints in compressed spectra. Run-2 searches for the ``golden channel'', pp→χ̃20χ̃1±→χ̃10 Z(*)χ̃10 W±(*), have reported mild excesses in parts of the soft two- and three-lepton data, with the corresponding simplified-model interpretations emphasizing mχ̃20≃ mχ̃1±≳200~GeV and a neutralino mass difference near $20$~GeV. We study this configuration in the Minimal Supersymmetric Standard Model (MSSM) with the Generalized minimal Supergravity (GmSUGRA) boundary conditions, imposing the Higgs, flavor, collider, relic-density and direct-detection constraints relevant to the spectrum. For both signs of μ, the solutions compatible with the Planck experiment contain an almost pure bino χ̃10 with mass about $260−−266$~GeV and a nearly degenerate wino-like χ̃20/χ̃1± pair near $280$~GeV. The resulting splitting, Δm21≃18.5--$19.1$~GeV, lies in the mass-difference region probed by the ATLAS and CMS soft-lepton searches and places the Z(*)/W(*) decays below the on-shell gauge-boson thresholds. The same compressed hierarchy keeps the wino states thermally populated during freeze-out, so bino-wino coannihilation yields a neutralino relic abundance consistent with the Planck experiment while the surviving solutions remain compatible with the direct-detection experimental bounds. Thus, the GmSUGRA boundary conditions provide a high-scale realization of the compressed bino-wino spectrum relevant to the LHC soft-lepton channel.
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BibTeX
@misc{khan2026compressed,
title = {{The compressed bino--wino dark matter in the GmSUGRA and the LHC soft-lepton searches}},
author = {Imtiaz Khan and Ali Muhammad and Tianjun Li and Shabbar Raza and Mussawir Khan},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.26533},
eprint = {2609.26533},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.26533},
}
RIS
TY - UNPB
TI - The compressed bino--wino dark matter in the GmSUGRA and the LHC soft-lepton searches
AU - Imtiaz Khan
AU - Ali Muhammad
AU - Tianjun Li
AU - Shabbar Raza
AU - Mussawir Khan
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.26533
UR - https://arxiv.org/abs/2609.26533
AB - The search for electroweak supersymmetric particles remains an important part of the LHC program since neutralinos and charginos with masses around a few hundred GeV are still compatible with the present constraints in compressed spectra. Run-2 searches for the ``golden channel'', pp→χ̃_2^0χ̃_1^±→χ̃_1^0 Z^(*)χ̃_1^0 W^±(*), have reported mild excesses in parts of the soft two- and three-lepton data, with the corresponding simplified-model interpretations emphasizing m_χ̃_2^0≃ m_χ̃_1^±≳200~GeV and a neutralino mass difference near $20$~GeV. We study this configuration in the Minimal Supersymmetric Standard Model (MSSM) with the Generalized minimal Supergravity (GmSUGRA) boundary conditions, imposing the Higgs, flavor, collider, relic-density and direct-detection constraints relevant to the spectrum. For both signs of μ, the solutions compatible with the Planck experiment contain an almost pure bino χ̃_1^0 with mass about $260−−266$~GeV and a nearly degenerate wino-like χ̃_2^0/χ̃_1^± pair near $280$~GeV. The resulting splitting, Δm_21≃18.5--$19.1$~GeV, lies in the mass-difference region probed by the ATLAS and CMS soft-lepton searches and places the Z^(*)/W^(*) decays below the on-shell gauge-boson thresholds. The same compressed hierarchy keeps the wino states thermally populated during freeze-out, so bino-wino coannihilation yields a neutralino relic abundance consistent with the Planck experiment while the surviving solutions remain compatible with the direct-detection experimental bounds. Thus, the GmSUGRA boundary conditions provide a high-scale realization of the compressed bino-wino spectrum relevant to the LHC soft-lepton channel.
ER -