Summary
This paper provides a comprehensive assessment of experimental data used in dispersive calculations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment. The authors examine tensions between recent high-precision measurements from CMD-3 and BABAR, evaluate systematic uncertainties in existing KLOE and BESIII data, and reassess the independent constraints provided by hadronic τ decays. The findings suggest larger unaccounted systematic effects than previously assigned and offer new perspectives on the longstanding tension between experimental muon g-2 measurements and Standard Model predictions.
UK applicability
This is fundamental particle physics research with no direct application to UK agricultural systems, soil health, or food production. It is not applicable to Vitagri's Pulse Brain focus areas.
Key measures
Electron-positron to pion pair cross sections in the ρ resonance region; higher-order radiative corrections in initial-state-radiation processes; hadronic τ decay measurements; comparison of muon g-2 experimental values with Standard Model dispersive predictions and lattice QCD calculations
Outcomes reported
The study assessed experimental data tensions in electron-positron annihilation cross-section measurements relevant to calculating the hadronic vacuum polarization contribution to the muon g-2 anomaly. The authors evaluated recent CMD-3 and BABAR measurements and their implications for resolving discrepancies between experimental muon g-2 measurements and Standard Model predictions.
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