  The electroweak (EW) sector of the Minimal Supersymmetric Standard Model
(MSSM) can account for a variety of experimental data. In particular, it can
explain the persistent 3-4 sigma discrepancy between the experimental result
for the anomalous magnetic moment of the muon and its Standard Model (SM)
prediction. The lightest supersymmetric particle (LSP), which we take as the
lightest neutralino, can furthermore account for the observed Dark Matter (DM)
content of the universe via coannihilation with the next-to-LSP (NLSP), while
being in agreement with negative results from Direct Detection (DD)
experiments. Concerning the unsuccessful searches for EW superparticles at the
LHC, owing to relatively small production cross-sections, a comparably light EW
sector of the MSSM is in full agreement with the experimental data. The DM
relic density can fully be explained by a mixed bino/wino LSP. Here we take the
relic density as an upper bound, which opens up the possibility of wino and
higgsino DM. We first analyze which mass ranges of neutralinos, charginos and
scalar leptons are in agreement with all experimental data, including relevant
LHC searches. We find roughly an upper limit of ~ 600 GeV for the LSP and NLSP
masses. In a second step we assume that the new result of the Run 1 of the
'MUON G-2' collaboration at Fermilab yields a precision comparable to the
existing experimental result with the same central value. We analyze the
potential impact of the combination of the Run 1 data with the existing muon
g-2 data on the allowed MSSM parameter space. We find that in this case the
upper limits on the LSP and NLSP masses are substantially reduced by roughly
100 GeV. We interpret these upper bounds in view of future HL-LHC EW searches
as well as future high-energy electron-positron colliders, such as the ILC or
CLIC.
