Improved Determination of the Hadronic Contribution to the Muon (g-2) and to alpha(M_Z**2) Using new Data from Hadronic Tau Decays

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dc.creatorAlemany, R.
dc.creatorDavier, M.
dc.creatorHocker, A.
dc.date1997-03-03
dc.date1997-03-05
dc.date.accessioned2026-07-07T10:33:28Z
dc.date.available2026-07-07T10:33:28Z
dc.descriptionWe 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=M_Z**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 a_mu(had) = (695.0 +/- 15.0) x 10^{-10} and delta(alpha(M_Z**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 a_mu(had) = (701.1 +/- 9.4) x 10^{-10} and delta(alpha(M_Z**2))(had) = (281.7 +/- 6.2) x 10^{-4}, where the latter is calculated using the contribution from the five lightest quarks.
dc.description23 pages, LaTex, 6 figures, Paper submitted to Zeitschrift fuer Physik C
dc.identifierhttps://arxiv.org/abs/hep-ph/9703220
dc.identifierhttp://arxiv.org/abs/hep-ph/9703220
dc.identifierEur.Phys.J.C2:123-135,1998
dc.identifierdoi:10.1007/s100520050127
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179123
dc.subjectHigh Energy Physics - Phenomenology
dc.titleImproved Determination of the Hadronic Contribution to the Muon (g-2) and to alpha(M_Z**2) Using new Data from Hadronic Tau Decays
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