2018/02/17 by Keshavarzi, Alexander, Nomura, Daisuke, Teubner, Thomas
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1802.06229
The hadronic vacuum polarisation contributions to the anomalous magnetic moment of the muon, aμ\rm had, VP have been re-evaluated from the combination of e+e-→ \rm hadrons cross section data. Focus has been placed on the development of a new data combination method, which fully incorporates all correlated statistical and systematic uncertainties in a bias free approach. Using these combined data have resulted in estimates of the hadronic vacuum polarisation contributions to g-2 of the muon of aμ\rm had, LO VP = (693.27 ± 2.46)× 10-10 and aμ\rm had, NLO VP = (-9.82 ± 0.04)× 10-10. The new estimate for the Standard Model prediction is found to be aμ\rm SM = (11 659 182.05 ± 3.56) × 10-10, which is 3.7σ below the current experimental measurement. In addition, the prediction for the hadronic contribution to the QED coupling at the Z boson mass has been calculated to be Δα\rm had(5)(MZ2)= (276.11 ± 1.11)× 10-4, resulting in α-1(MZ2) = 128.946 ± 0.015.