Supersymmetric contributions to muon g-2 and the electroweak precision measurements

Abstract

In view of the recent measurement of the muon g-2 and finalization of the LEP electroweak data, we re-examine all the new particle contributions to those observables in the MSSM. The SM fits the latest electroweak data excellently with the observed top-quark mass and the Higgs-boson mass of around 100 GeV, and so does the MSSM in the decoupling limit. The MSSM gives a slightly better fit to the data than the SM (Δχ^2_{min} \sim -2) when relatively light left-handed sleptons of mass \sim 200 GeV and a light chargino of mixed higgsino-wino character (μ/M_2 \sim 1) with mass \sim 100 GeV co-exist. The improvement in the fit diminishes quickly for wino- or higgsino- dominant charginos, for heavier charginos, and for lighter sleptons. We find that the MSSM contributions to the muon g-2 is most efficient when the light chargino has a mixed character. If \tanβ< 10, the set of a light mixed chargino and light sleptons that is favored by the electroweak data is also favored by the g-2 data for μ>0. Models with light gauginos (μ/M_2 > 10) or light higgsinos (μ/M_2 < 0.1) give significant contributions to muon g-2 only for large \tanβ(\simgt 15).

12 pages, latex, 4 figures. reference added. version to appear in Phys.Lett.B

References in corpus (9)

• Precise Measurement of the Positive Muon Anomalous Magnetic Moment
• Muon anomalous magnetic dipole moment in supersymmetric theories
• Supersymmetry and the Anomalous Anomalous Magnetic Moment of the Muon
• Implications of Muon g-2 for Supersymmetry and for Discovering Superpartners Directly
• Implications of muon anomalous magnetic moment for supersymmetric dark matter
• Neutrino masses, muon g-2, and lepton-flavour violation in the supersymmetric see-saw model
• Muon g-2, Dark Matter Detection and Accelerator Physics
• Recent Result from E821 Experiment on Muon g-2 and Unconstrained Minimal Supersymemtric Standard Model
• No-Scale Scenarios in the Light of New Measurement of Muon Anomalous Magnetic Moment

Cited by in corpus (24)

• The Muon Magnetic Moment and Supersymmetry
• Electroweak Precision Observables in the Minimal Supersymmetric Standard Model
• New physics explanations of $a_{\mu }$ in light of the FNAL muon $g-2$ measurement
• Indirect Sensitivities to the Scale of Supersymmetry
• Prediction for the Lightest Higgs Boson Mass in the CMSSM using Indirect Experimental Constraints
• The MSSM confronts the precision electroweak data and the muon g-2
• Supersymmetry and the positron excess in cosmic rays
• The anomalous magnetic moment of the muon in the D-brane realization of the Standard Model
• Constraining SUSY models with Fittino using measurements before, with and beyond the LHC
• Closing in on the chargino contribution to the muon g-2 in the MSSM: current LHC constraints
• Anomaly-Mediated Supersymmetry Breaking with Axion
• Updated Implications of the Muon Anomalous Magnetic Moment for Supersymmetry
• Implications of the Muon Anomalous Magnetic Moment for Supersymmetry
• Muon anomalous magnetic moment in the standard model extension
• Resummations with renormalon effects for the hadronic vacuum polarization contribution to the muon (g-2)
• Noncommutative QED and Muon Anomalous Magnetic Moment
• b -> s gamma in the left-right supersymmetric model
• The stau exchange contribution to muon g-2 in the decoupling solution
• Muon Magnetic Dipole Moment and Higgs Mass in Supersymmetric SU(5) Models
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• $B\to X_s{l}^{+}{l}^{-}$ in the left-right supersymmetric model
• Composite (pseudo) scalar contributions to muon g-2
• Recent Muon g-2 Result in Deflected Anomaly-Mediated Supersymmetry Breaking
• Supersymmetry and Electroweak Leptonic Observables