The experimental measurement of the muon's magnetic properties has diverged from Standard Model theoretical predictions for over 10 years (as of 2021).
Notes on verification
Well-documented by Brookhaven E821 (2004) and Fermilab Muon g-2 (2021) experiments; discrepancy with Standard Model predictions persisted for well over a decade, confirmed by multiple independent physics institutions and peer-reviewed/primary sources. [tier=gold indep_score=0.983 clusters=3 claim_tier=notable | framework convergence=single on Standard Model theoretical prediction for muon anomalous magnetic moment as compiled by the Muon g-2 Theory Initiative, compared against Brookhaven E821 and Fermilab experimental measurements (upstreams: Brookhaven National Laboratory E821 experiment, Fermilab Muon g-2 experiment, Muon g-2 Theory Initiative) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- Physique des particules : les muons nous mèneront-ils vers une nouvelle physique ? | CNRS (seed:science_and_space)
- https://muon-g-2.fnal.gov/result2021.pdf (corroboration)
- https://www.symmetrymagazine.org/article/april-2021/fermilab-muon-g-2-results (corroboration)
- https://www.bnl.gov/newsroom/news.php?a=13208 (corroboration)