Novel evaluation of the two-pion contribution to the nucleon isovector   form factors
  We calculate the two-pion continuum contribution to the nucleon isovector spectral functions drawing upon the new high statistics measurements of the pion form factor by the CMD-2, KLOE, and SND collaborations. The general structure of the spectral functions remains unchanged, but the magnitude increases by about 10%. Using the updated spectral functions, we calculate the contribution of the two-pion continuum to the nucleon isovector form factors and radii. We compare the isovector radii with simple rho-pole models and illustrate their strong underestimation in such approaches. Moreover, we give a convenient parametrization of the result for use in future form factor analyses. 
M.A. Belushkin (Bonn U.), H.-W. Hammer (Bonn U.), Ulf-G. Mei{\ss}ner   (Bonn U. and FZ J\"ulich)