The new MUON G-2 result and supersymmetry

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)(exp)=(11659206.1 +/- 4.1)x10(-10), yielding a new deviation from the SM prediction of Delta a(mu)=(25.1 +/- 5.9)x10(-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 similar to 750GeV. 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.

Automated summary

The electroweak sector of the Minimal Supersymmetric Standard Model with the lightest neutralino as a Dark Matter candidate can explain various experimental data, including DM content of the universe and EW SUSY searches at the LHC. The recently published MUON G-2 result is in agreement with the older BNL result, providing a new deviation from the Standard Model prediction of 4.2 sigma. This indicates updated upper limits on the allowed parameter space of the EW sector of the MSSM.