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Model-independent parametrization of the hadronic vacuum polarization and g-2 for the muon on the lattice
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The leading hadronic contribution to the muon anomalous magnetic moment is given by a weighted integral over euclidean momentum of the hadronic vacuum polarization. This integral is dominated by momenta of order the muon mass. Since the finite volume in lattice QCD makes it difficult to compute the vacuum polarization at a large number of low momenta with high statistics (combined with the fact that one cannot compute it at zero momentum), a parametrization of the vacuum polarization is required to extrapolate the data. A much used functional form is based on vector meson dominance, which introduces model dependence into the lattice computation of the magnetic moment. Here we introduce a model-independent extrapolation method, and present a few first tests of this new method.
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The hadronic contribution to the running of $\alpha$ and the electroweak mixing angle
A lattice QCD update computes the high-energy window of the hadronic vacuum polarization for the running of α and sin²θ_W with improved control of discretization errors.
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