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We present a theoretical parametrization of the nucleon electromagnetic formfactors (FFs) based on a combination of chiral effective field theory anddispersion analysis. The isovector spectral functions on the two-pion cut arecomputed using elastic unitarity, chiral pion-nucleon amplitudes, and timelikepion FF data. Higher-mass isovector and isoscalar t-channel states aredescribed by effective poles, whose strength is fixed by sum rules (charges,radii). Excellent agreement with the spacelike proton and neutron FF data isachieved up to Q^2 \sim 1 GeV^2. Our parametrization provides properanalyticity and theoretical uncertainty estimates and can be used for low-Q^2FF studies and proton radius extraction.

Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory