The new “MUON G-2” result and supersymmetry

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 $$3-4\,\sigma $$ 3 - 4 σ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $$(g-2)_\mu $$ ( g - 2 ) μ , and its Standard Model (SM) prediction. The recently published “MUON G-2” result is within $${0.8}\,\sigma $$ 0.8 σ in agreement with the older BNL result on $$(g-2)_\mu $$ ( g - 2 ) μ . The combination of the two results was given as $$a_\mu ^{\mathrm{exp}} = (11 659 {206.1}\pm {4.1}) \times 10^{-10}$$ a μ exp = ( 11659 206.1 ± 4.1 ) × 10 - 10 , yielding a new deviation from the SM prediction of $$\Delta a_\mu = ({25.1}\pm {5.9}) \times 10^{-10}$$ Δ a μ = ( 25.1 ± 5.9 ) × 10 - 10 , corresponding to $${4.2}\,\sigma $$ 4.2 σ . 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 $$(g-2)_\mu $$ ( g - 2 ) μ 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 $$\sim 750 \,\, \mathrm {GeV}$$ ∼ 750 GeV . In this way, a clear target is confirmed for future (HL-)LHC EW searches, as well as for future high-energy $$e^+e^-$$ e + e - colliders, such as the ILC or CLIC.

Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations

“…While in principle SUSY models are capable of explaining this discrepancy [88,89] (see also Ref. [90] for an analysis of the EW MSSM sector, Ref. [91] for a specific NMSSM analysis, Ref.…”

Muon g-2, Neutralino Dark Matter and Stau NLSP

“…This new world average points to a 4.2σ deviation from the SM predictions [3][4][5]. The supersymmetric contributions to muon g − 2 arise from a number of super partners which couple to muon at tree-level [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In order to solve this discrepancy, the SUSY electroweak sector should involve relatively light neutralinos, charginos and sleptons.…”

Supersymmetric explanation of the muon g-2 anomaly with and without stable neutralino

“…1 to be the stable LSP and confront it with the latest phenomenological constraints. Several studies have explored this possibility in the recent times [34][35][36][37][38][39][40][41][42][43][44][45][46]. Refs.…”

“…Refs. [34][35][36][37][38][39], e.g. have performed inclusive random scans over all the relevant MSSM parameters to provide upper and lower limits on the superpartner masses satisfying (g − 2) µ , DM and LHC data.…”