Abstract
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, (g-2)_mu , and its Standard Model (SM) prediction. The lightest supersymmetric particle (LSP), which we take as the lightest neutralino, {tilde{chi }}_{1}^0, 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 particles 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 sim 600 ,, mathrm {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 (g-2)_mu 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 ,, mathrm {GeV}. We interpret these upper bounds in view of future HL-LHC EW searches as well as future high-energy e^+e^- colliders, such as the ILC or CLIC.
Highlights
One of the most important tasks at the LHC is to search for physics beyond the Standard Model (SM)
Green: all points that are in agreement with (g − 2)μ, taking into account the current or anticipated future limits, see Eqs. (3) and (4), respectively
Blue: points that obey the upper limit of the Dark Matter (DM) relic density, see Eq (7)
Summary
One of the most important tasks at the LHC is to search for physics beyond the Standard Model (SM). The lightest SUSY particle (LSP), the lightest neutralino χ10, can explain the CDM relic abundance [13,14], while not being in conflict with negative DD results and the negative LHC searches. [15], assuming that the LSP gives rise to the full amount of DM relic density, upper limits on the various masses of the EW SUSY sector were derived, while being in agreement with all other experimental data.. We analyze the four cases of bino-dominated, bino/wino, (nearly pure) wino and higgsino LSP for the current deviation of (g − 2)μ, as well as for the assumption of improved (g − 2)μ bounds from the combination of existing experimental data with the Run 1 data of the “MUON G-2” experiment. The derived upper limits on the EW masses are discussed in the context of the upcoming searches at the HL-LHC as well as at possible future e+e− colliders, such as the ILC [37,38] or CLIC [38,39,40,41]
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