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Vacuum polarization integrals involve the vector spectral functions which can be experimentally determined from two sources: (i) e+e- annihilation cross sections and (ii) hadronic tau decays. Recently results with comparable precision have become available from CMD-2 on one side, and ALEPH, CLEO and OPAL on the other. The comparison of the respective spectral functions involves a correction from isospin-breaking effects, which is evaluated. After the correction it is found that the dominant pi+pi- spectral functions do not agree within experimental and theoretical uncertainties. Some disagreement is also found for the 4pi spectral functions. The consequences of these discrepancies for vacuum polarization calculations are presented, with the emphasis on the muon anomalous magnetic moment. Adding quadratically experimental and theoretica...
Comment: 15 pages, 12 figures, LaTex, Talk given at the Fourth International Workshop on Tau Lepton Physics (TAU96), Colorado, September 1996
Comment une anomalie observée en 1964 lors d'une expérience sur la désintégration de particules appelées "kaons", a-t-elle contribué à ouvrir la voie au développement du modèle phare de la physique des particules ?
En août dernier, les expériences BABAR et Belle ont annoncé presque simultanément la découverte d'une « différence spectaculaire entre matière et antimatière ». Cette information a été immédiatement relayée sous forme de communiqués de presse avant d'être présentée à la Conférence Internationale de Physique des Hautes Energies (ICHEP 2004) à Pékin deux semaines plus tard.
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