Can VMD improve the estimate of the muon g-2 ?

preprint2009arXivOpen access

Abstract

We show that a VMD based theoretical input allows for a significantly improved accuracy for the hadronic vacuum polarization of the photon which contributes to the theoretical estimate of the muon g-2. We also show that the only experimental piece of information in the ττ decay which cannot be accounted for is the accepted value for ${\rm Br}(τ\ra ππν_τ)$, while the spectum lineshape is in agreement with expectations from e+e−e^+ e^- annihilations.

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