Analysis of pion electromagnetic form factor by the dispersion relation with QCD constraint

Details Analysis of pion electromagnetic form factor by the dispersion relation with QCD constraint Analysis of pion electromagnetic form factor by the dispersion relation with QCD constraint

2001-11-13

arxiv.org/abs/hep-ph/0111168v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

The pion electromagnetic form factor is investigated by using the dispersion relation with the superconvergence condition, which was proposed to synthesize the vector meson dominance model and QCD. The absorptive part is given as an addition of the resonance and the QCD terms, the latter being parametrized so as to realize the prediction of perturbative QCD. The experimental data are analyzed and the parameters for the QCD part, the resonance part as well, are determined. Existing experiments for the form factor are reproduced very well both for the space-like and time-like momenta.

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