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IHEP 98 - 48
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| V.V. Ezhela B.V. Polishchuk | ||
| Reanalysis of e+-p Elastic Scattering Data in Terms of Proton Electromagnetic Formfactors | ||
| Protvino, 1999.-p.31, figs.5, tables 9, refs.:31. | ||
We have made the comparison of three parametrizations of the proton electromagnetic form factors in the space-like region using the largest data set on $e^{\pm} p$ elastic scattering ever used. All models have a correct analytical structure with a minimal set of well known singularities. For the first time an effective two-pion intermediate coulombic bound state (pionium) was included into GVMD for nucleon formfactors. For the proton charge radius an estimate derived from our best fits is as follows: $$ r_E^p [\rm fm] = 0.897 \pm 0.002(exp) \pm 0.001(norm) \pm 0.003(models).$$ The traditional ``model independent'' fit by quadratic polynomial gives, in our estimation technology, a much cruder estimate $$ r^p_{E,polinomial} [\rm fm] = 0.887 \pm 0.006(exp) \pm 0.096(norm).$$ Both estimates are closer to the value estimated from the recent hydrogen Lamb shift measurements.
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