2022/12/07 by Luc Darmé, Darmé, Luc, Giovanni Grilli di Cortona +3
Computer Science · Physics and Astronomy · #Advanced Data Storage Technologies #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2212.03877
openalex publication_date 2022/12/07 · openalex created_date 2022/12/22 · openalex updated_date 2026/07/28
Recent lattice determinations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment aμ\rm HVP have confirmed the discrepancy with the data-driven dispersive method. In the meanwhile the CMD-3 collaboration has reported a result for the e+e-→ π+π- cross section considerably larger than previous experimental results (and close to the lattice determinations) exacerbating the discordance between different e+e- datasets. We explore to what extent these disagreements can be accounted for by some new physics effect altering selectively the individual experimental determinations of σ(e+e- → hadrons). We find that specific effects of GeV-scale new particles are able to shift upwards the KLOE and BaBar results in the low and intermediate energy windows, while leaving unaffected the CMD-3 energy scan. Although these new physics effects cannot fully explain all the discrepancies among the different σ(e+e- → hadrons) datasets, they succeed in mitigating the overall tension between data-driven and lattice estimates of aμ\rm HVP. Remarkably, the additional loop corrections involving the new particles concur to solve the residual discrepancy with the experimental value of (g-2)μ.