In a 5-parameter Gari-Krümpelmann model, the dispersive two-pion continuum replaces the rho pole in the isovector nucleon form-factors while fitting the world data, yielding a single scale Lambda = 1.49 GeV.
Proton electromagnetic form-factors: Basic notions, present achievements and future per- spectives,
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Nucleon electromagnetic form-factors in a minimal Gari-Kr\"umpelmann model including the explicit two-pion continuum
In a 5-parameter Gari-Krümpelmann model, the dispersive two-pion continuum replaces the rho pole in the isovector nucleon form-factors while fitting the world data, yielding a single scale Lambda = 1.49 GeV.