Extended Gari-Krumpelmann model fits to nucleon electromagnetic form factors
Abstract
Significant new nucleon electromagnetic form factor data has accumulated since the Gari-Krumpelmann model (GK) was last adjusted in 1992. The model includes the major vector meson pole contributions and at high momentum transfer conforms to the predictions of QCD. Its simple analytic form is very useful for incorporating the nucleon form factors into predictions for many-nucleon systems, including the deuteron. We consider different parameterizations of the model's hadronic form factors and the effect of including the width of the rho meson and the addition of the next (in mass) isospin 1 vector meson. These alternatives are fitted to the world data. We obtain much better fits to the data than obtained with the original GK parameters. The sensitivity to the particular parameterization is discussed. Projections are made to higher momentum transfers which are now accessible. The projections vary little for the preferred models.Keywords
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