Abstract
The electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM), with the lightest neutralino as Dark Matter (DM) candidate, can account for a variety of experimental data. This includes the DM content of the universe, DM direct detection limits, EW SUSY searches at the LHC and in particular the so far 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 recently published “MUON G-2” result is within {0.8},sigma in agreement with the older BNL result on (g-2)_mu . The combination of the two results was given as a_mu ^{mathrm{exp}} = (11 659 {206.1}pm {4.1}) times 10^{-10}, yielding a new deviation from the SM prediction of Delta a_mu = ({25.1}pm {5.9}) times 10^{-10}, corresponding to {4.2},sigma . Using this improved bound we update the results presented in Chakraborti et al. (Eur Phys J C 80(10):984, 2020) and set new upper limits on the allowed parameters space of the EW sector of the MSSM. We find that with the new (g-2)_mu result the upper limits on the (next-to-) lightest SUSY particle are in the same ballpark as previously, yielding updated upper limits on these masses of sim 750 ,, mathrm {GeV}. In this way, a clear target is confirmed for future (HL-)LHC EW searches, as well as for future high-energy e^+e^- colliders, such as the ILC or CLIC.
Highlights
Searches for Beyond the Standard Model (BSM) particles are performed directly, such as at the LHC, or indirectly in low-energy experiments and via astrophysical measurements
In Ref. [5] we performed an analysis taking into account all relevant data for the EW sector of the Minimal Supersymmetric Standard Model (MSSM), assuming that the lightest SUSY particle (LSP) is given by the lightest neutralino, χ10, that makes up the full Dark Matter (DM) content of the universe [6,7]
The electroweak (EW) sector of the MSSM, consisting of charginos, neutralinos and scalar leptons can account for a variety of experimental data: the CDM relic abundance with the lightest neutralino, χ10 as LSP, the bounds from direct detection (DD) experiments as well as from direct searches at the LHC
Summary
Searches for Beyond the Standard Model (BSM) particles are performed directly, such as at the LHC, or indirectly in low-energy experiments and via astrophysical measurements. [5] we performed an analysis taking into account all relevant data for the EW sector of the MSSM, assuming that the lightest SUSY particle (LSP) is given by the lightest neutralino, χ10, that makes up the full Dark Matter (DM) content of the universe [6,7].1. Three different scenarios were analyzed, classified by the mechanism that brings the LSP relic density into agreement with the measured values. Using the current bounds we found upper limits on the LSP masses. We analyze the impact of the combination of the Run 1 FNAL data with the previous BNL result on the allowed MSSM parameter space. We will comment on the discovery prospects for these particles at possible future e+e− colliders, such as the ILC [37,38] or CLIC [38,39,40,41]
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