Supersymmetric interpretation of the muon g – 2 anomaly

Abstract

The Fermilab Muon g− 2 collaboration recently announced the first result of measurement of the muon anomalous magnetic moment (g− 2), which confirmed the previous result at the Brookhaven National Laboratory and thus the discrepancy with its Standard Model prediction. We revisit low-scale supersymmetric models that are naturally capable to solve the muon g− 2 anomaly, focusing on two distinct scenarios: chargino-contribution dominated and pure-bino-contribution dominated scenarios. It is shown that the slepton pair-production searches have excluded broad parameter spaces for both two scenarios, but they are not closed yet. For the chargino-dominated scenario, the models with $$ {m}_{{\tilde{\mu}}_{\mathrm{L}}}\gtrsim {m}_{{\tilde{\chi}}_1^{\pm }} $$ m μ ˜ L ≳ m χ ˜ 1 ± are still widely allowed. For the bino-dominated scenario, we find that, although slightly non-trivial, the region with low tan β with heavy higgsinos is preferred. In the case of universal slepton masses, the low mass regions with $$ {m}_{\tilde{\mu}} $$ m μ ˜ ≲ 230 GeV can explain the g− 2 anomaly while satisfying the LHC constraints. Furthermore, we checked that the stau-bino coannihilation works properly to realize the bino thermal relic dark matter. We also investigate heavy staus case for the bino-dominated scenario, where the parameter region that can explain the muon g− 2 anomaly is stretched to $$ {m}_{\tilde{\mu}} $$ m μ ˜ ≲ 1.3 TeV.

Improved (g − 2)μ measurement and singlino dark matter in μ-term extended ℤ3-NMSSM

“…This point was recently emphasized by the authors of [46,47]. Moreover, as mentioned in [96,154], future high luminosity LHC can significantly extend the LHC Run-II's capability in sparticle detection. The preliminary analyses carried out in, e.g., [155][156][157], have proven this point.…”

Supersymmetric alignment models for (g − 2)μ

“…The purple shaded region is excluded by searches for slepton pair production at the Large Hadron Collider (LHC) [71][72][73][74], as discussed in refs. [75,76] the muon g − 2 anomaly. Here, for reference values of the model parameters, we take m q = M 3 = 5 TeV, m = M 1,2 = µ = 500 GeV and tan β = 50.…”

“…We also take account of searches for slepton pair production at the LHC [71][72][73][74], as discussed in refs. [75,76]. The black solid lines in the left panel correspond to the current electron EDM constraint |d e | = 1.1 × 10 −29 e cm with different amounts of tuning in the nonzero CP phase contribution to the µ parameter.…”

“…. The purple shaded region is excluded by searches for slepton pair production at the Large Hadron Collider (LHC)[71][72][73][74], as discussed in refs [75,76]…”

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.…”