1997/03/05 by R. Alemany, M. Davier, A. Hocker +1 · 3 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1007/s100520050127
published as Eur.Phys.J.C2:123-135,1998 · 23 pages, LaTex, 6 figures, Paper submitted to Zeitschrift fuer Physik C
arxiv created 1997/03/05 · openalex publication_date 1998/01/01 · arxiv updated 2009/11/30 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/31
We have reevaluated the hadronic contribution to the anomalous magnetic moment of the muon (g-2) and to the running of the QED fine structure constant alpha(s) at s=MZ**2. We incorporated new data from hadronic tau decays, recently published by the ALEPH Collaboration. In addition, compared to previous analyses, we use more extensive e+e- annihilation data sets. The integration over the total hadronic cross section is performed using experimental data up to 40 GeV and results from perturbative QCD above 40 GeV. The improvement from tau data concerns mainly the pion form factor, where the uncertainty in the corresponding integral could be reduced by more than a factor of two. We obtain for the lowest order hadronic vacuum polarization graph amu(had) = (695.0 +/- 15.0) x 10-10 and delta(alpha(MZ**2))(had) = (280.9 +/- 6.3) x 10-4 using e+e- data only. The corresponding results for combined e+e- and tau data are amu(had) = (701.1 +/- 9.4) x 10-10 and delta(alpha(MZ**2))(had) = (281.7 +/- 6.2) x 10-4, where the latter is calculated using the contribution from the five lightest quarks.