What has the LHC told us about the electroweakino sector of the Minimal Supersymmetric Standard Model?
Abstract
We perform global fits of the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM) using a comprehensive set of LEP searches, 34 Run 2 LHC searches, and 63 Run 2 LHC measurements. Scanning the bino, wino and Higgsino mass parameters, and the ratio of the Higgs vacuum expectation values, we find that for a light, bino χ̃10, the mass of the next-to-lightest neutralino must be mχ̃20 ≳ 760 GeV. While MSSM electroweakinos can explain individual excesses observed by ATLAS and CMS in searches targeting compressed spectra, we find no scenarios that fit these excesses simultaneously. When we add a light gravitino, neutralinos are further excluded up to about 1 TeV, though this depends on their composition; Higgsino-dominated χ̃10 requires only mχ̃10 ≈ mχ̃20 ≳ 650 GeV. Lastly, the newer LHC searches and measurements exclude a low-mass region that was preferred in a previous study. This is the most complete summary of collider constraints on the electroweakino sector of the MSSM performed to date.
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BibTeX
@misc{athron2026what,
title = {{What has the LHC told us about the electroweakino sector of the Minimal Supersymmetric Standard Model?}},
author = {Peter Athron and Csaba Balázs and Andy Buckley and Jon Butterworth and Christopher Chang and Andrew Fowlie and Tomás E Gonzalo and Vinay Hegde and Ida-Marie Fauske Johansson and Adil Jueid and Tore Klungland and Anders Kvellestad and Farvah Mahmoudi and Gregory D Martinez and Holly Pacey and Tomasz Procter and Are Raklev and Roberto Ruiz de Austri and Pat Scott and Martin White and Yang Zhang and Pengxuan Zhu},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12914},
eprint = {2609.12914},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759410v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - What has the LHC told us about the electroweakino sector of the Minimal Supersymmetric Standard Model?
AU - Peter Athron
AU - Csaba Balázs
AU - Andy Buckley
AU - Jon Butterworth
AU - Christopher Chang
AU - Andrew Fowlie
AU - Tomás E Gonzalo
AU - Vinay Hegde
AU - Ida-Marie Fauske Johansson
AU - Adil Jueid
AU - Tore Klungland
AU - Anders Kvellestad
AU - Farvah Mahmoudi
AU - Gregory D Martinez
AU - Holly Pacey
AU - Tomasz Procter
AU - Are Raklev
AU - Roberto Ruiz de Austri
AU - Pat Scott
AU - Martin White
AU - Yang Zhang
AU - Pengxuan Zhu
PY - 2026
DA - 2026/09/11
PB - HAL
DO - 10.48550/arxiv.2609.12914
UR - https://hal.science/hal-05759410v1
AB - We perform global fits of the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM) using a comprehensive set of LEP searches, 34 Run 2 LHC searches, and 63 Run 2 LHC measurements. Scanning the bino, wino and Higgsino mass parameters, and the ratio of the Higgs vacuum expectation values, we find that for a light, bino χ̃_1^0, the mass of the next-to-lightest neutralino must be m_χ̃_2^0 ≳ 760 GeV. While MSSM electroweakinos can explain individual excesses observed by ATLAS and CMS in searches targeting compressed spectra, we find no scenarios that fit these excesses simultaneously. When we add a light gravitino, neutralinos are further excluded up to about 1 TeV, though this depends on their composition; Higgsino-dominated χ̃_1^0 requires only m_χ̃_1^0 ≈ m_χ̃_2^0 ≳ 650 GeV. Lastly, the newer LHC searches and measurements exclude a low-mass region that was preferred in a previous study. This is the most complete summary of collider constraints on the electroweakino sector of the MSSM performed to date.
ER -