The Muon (g-2) Theory Value: Present and Future

Abstract

This White Paper briefly reviews the present status of the muon (g-2) Standard-Model prediction. This value results in a 3 - 4 standard-deviation difference with the experimental result from Brookhaven E821. The present experimental uncertainty is $\pm 63\times 10^{-11}$ (0.54~ppm), and the Standard-Model uncertainty is $\simeq \pm 49\times 10^{-11}$. Fermilab experiment E989 has the goal to reduce the experimental error to $\pm 16\times 10^{-11}$. Improvements in the Standard-Model value, which should be achieved between now and when the first results from Fermilab E989 could be available, should lead to a Standard-Model uncertainty of $\sim \pm 35\times 10^{-11}$. These improvements would halve the uncertainty on the difference between experiment and theory, and should clarify whether the current difference points toward New Physics, or to a statistical fluctuation. At present, the (g-2) result is arguably the most compelling indicator of physics beyond the Standard Model and, at the very least, it represents a major constraint for speculative new theories such as supersymmetry, dark gauge bosons or extra dimensions.

Whitepaper prepared for the US Particle Physics "Snowmass" Self Study

Cited by in corpus (31)

• The muon $g-2$ and $\alpha (M_Z^2)$: a new data-based analysis
• Low-Energy Effective Field Theory below the Electroweak Scale: Operators and Matching
• Lepton Flavor Violation in the Standard Model with general Dimension-Six Operators
• Lepton Portal Dark Matter
• The hadronic vacuum polarization contribution to the muon $g-2$ from lattice QCD
• On the precision of a data-driven estimate of hadronic light-by-light scattering in the muon g-2: pseudoscalar-pole contribution
• Leptophilic Effective WIMPs
• The VV'P form factors in resonance chiral theory and the pi-eta-eta' light-by-light contribution to the muon g-2
• Light Axial Vectors, Nuclear Transitions, and the ${}^8$Be Anomaly
• Search for the Electric Dipole Moment and anomalous magnetic moment of the tau lepton at tau factories
• Letter of Intent for the LUXE Experiment
• Study of the process $e^{+}{e}^{-}\to K_S^0{K}_L^0$ in the center-of-mass energy range 1004--1060 MeV with the CMD-3 detector at the VEPP-2000 $e^{+}{e}^{-}$ collider
• Probing the MSSM explanation of the muon g-2 anomaly in dark matter experiments and at a 100 TeV $pp$ collider
• MUonE sensitivity to new physics explanations of the muon anomalous magnetic moment
• Hadronic vacuum polarization and muon g-2 from magnetic susceptibilities on the lattice
• Beyond Minimal Lepton Flavored Dark Matter
• New Physics Suggested by Atomki Anomaly
• GUT-inspired MSSM in light of muon $g-2$ and LHC results at $\sqrt{s}=13$ TeV
• Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
• 125 GeV Higgs boson mass and muon g-2 in 5D MSSM
• Revisiting Generalized Two Higgs Doublet Model in the Light of Muon Anomaly and Lepton Flavor Violating Decays at HL-LHC
• Dead or Alive? Implications of the Muon Anomalous Magnetic Moment for 3-3-1 Models
• The Mellin-Barnes Approach to Hadronic Vacuum Polarization and $g_{\mu }-2$
• The laser-based gain monitoring system of the calorimeters in the Muon $g-2$ experiment at Fermilab
• Two Light Stops in the NMSSM and the LHC
• Generalized 2HDM with wrong-sign lepton Yukawa coupling, in light of $g_{\mu }-2$ and lepton flavor violation at the future LHC
• Hadronic Vacuum Polarization in QCD and its Evaluation in the Euclidean
• Polarized Lepton-Nucleon Elastic Scattering and a Search for a Light Scalar Boson
• The CP-Violating pMSSM
• $\mu \to e\gamma$ in a supersymmetric radiative neutrino mass model
• Effect of large light-heavy neutrino mixing and natural type-II seesaw dominance to lepton flavor violation and neutrinoless double beta decay