Summary
This theoretical physics paper presents a systematic framework for reconciling significant tensions between lattice QCD and data-driven experimental determinations of hadronic vacuum polarisation, a quantity critical for predicting the muon's anomalous magnetic moment and the running of the electromagnetic coupling. By testing whether the observed discrepancies can be explained by modest modifications to the experimental R-ratio spectrum, the authors show that a ~5% increase in ρ-peak contributions would bring the two approaches into agreement across all three observables studied, though this adjustment substantially exceeds current experimental uncertainties. The work establishes methods for combining these complementary approaches and clarifies the limits of what can be inferred about the R-ratio from a finite set of precision observables.
UK applicability
This is a theoretical physics contribution with no direct application to UK agricultural, soil health, or food systems practice. It is likely included in the Vitagri database in error, as the research concerns fundamental particle physics rather than farming systems, nutrition, or food science.
Key measures
Hadronic vacuum polarization contributions to muon anomalous magnetic moment (aμ); intermediate window observable; running of electromagnetic coupling α between spacelike virtualities 1–10 GeV²; R-ratio modifications in centre-of-mass energy intervals
Outcomes reported
The study presents a framework for comparing hadronic vacuum polarization (HVP) results from lattice QCD and experimental e+e− → hadrons cross section data, and tests whether tensions between the two approaches can be explained by modifying the R-ratio in different energy intervals. The analysis considers three precisely-determined observables: the leading hadronic contribution to the muon anomalous magnetic moment, the intermediate window observable, and the running of the electromagnetic coupling α.
Topic tags
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