Vector meson dominance pion electromagnetic form factor with the σ−model loop corrections
نویسنده
چکیده
A model is developed for electromagnetic form factor of the pion. One-loop corrections are included in the linear σ−model. The ρ−meson contribution is added in an extended VMD model. The form factor, calculated without fitting parameters, is in a good agreement with experiment for space-like and time-like photon momenta. Loop corrections to the two-pion hadronic contribution a (had,π) μ to the muon anomalous magnetic moment are calculated. The optimal value of the σ−meson mass appears to be close to the ρ−meson mass.
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