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Research dossier · version 1 · updated Oct 30, 2026

Particle Physics & Beyond the Standard Model: State of the Field (October 2026)

This dossier covers the muon anomalous magnetic moment and the hadronic inputs that limit its Standard Model prediction, lepton flavor and flavor-anomaly tests, neutrino mass measurements and direct searches for light or long-lived new states. The main takeaway is that the 2025 Fermilab result has sharpened the muon g-2 test, while hadronic vacuum polarization remains the dominant uncertainty and no confirmed new-physics signal is established in the sources reviewed.

4,477 words60 sources30 evidence-mapped claims16 benchmarks16 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Muon g-2 experiment
  6. Standard Model prediction and hadronic vacuum polarization
  7. Hadronic light-by-light scattering
  8. Beyond-SM explanations and their tests
  9. Lepton flavor and flavor anomalies
  10. Neutrino masses and oscillations
  11. Higgs sector and collider searches
  12. Quantitative benchmarks
  13. Open problems and active debates
  14. Major programs and players
  15. Outlook: what to watch (November 2026 to early 2028)
  16. Key papers
  17. Glossary

Sample findings

  • The 2025 Fermilab measurement, using data taken in 2020 to 2023 and combined with earlier Fermilab runs, gives a_μ = 116 592 070.5(14.8) × 10^-11, a 127 ppb precision.
  • The experimental world average including the Brookhaven result is 116 592 071.5(14.5) × 10^-11, a 124 ppb value.
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