2019/03/22 by Keshavarzi, Alexander
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1903.10349
The hadronic vacuum polarisation contributions to the anomalous magnetic moment of the muon, aμ\rm had, VP are evaluated dispersively via a combination of experimentally measured e+e-→ \rm hadrons cross section data. Many experiments have dedicated programmes to precisely measure these final states, meaning that a vast amount of data is now available and that, in some cases, overall precision has reached the sub-percent level. However, data tensions are evident between measurements of the same hadronic channels from different experiments, which reduces the overall quality of the data combinations used to determine aμ\rm had, VP. The inclusion of these data in the KNT18 analysis results in aμ\rm had, LO VP = (693.26 ± 2.46)× 10-10 and aμ\rm had, NLO VP = (-9.82 ± 0.04)× 10-10. The corresponding new estimate for the Standard Model prediction is found to be aμ\rm SM = (11 659 182.04 ± 3.56) × 10-10, which is 3.7σ below the current experimental measurement.