Determining the axial radius of the nucleon from data on pion electroproduction

Véronique Bernard, Norbert Kaiser, Ulf G. Meissner

Research output: Contribution to journalArticlepeer-review

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Abstract

We discuss a low-energy theorem of threshold pion electroproduction which allows one to determine the axial root-mean-square radius rA of the nucleon. We show that at the same order where the radius appears, pion loops induce a small correction to the momentum dependence of the electric dipole amplitude E0+(-). This correction amounts to a decrease of the axial mean-square radius by 5% from the electroproduction data and allows one to explain the small discrepancy to the values determined from (anti)neutrino-proton scattering data.

Original languageEnglish
Pages (from-to)1877-1879
Number of pages3
JournalPhysical Review Letters
Volume69
Issue number13
DOIs
StatePublished - 1992

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