Axial meson contribution to proton form factors

Abstract

The effect of axial meson exchange on extraction of proton electromagnetic form factors in $ep$ scattering is calculated. Taking as an example $f_1(1285)$ meson exchange, it is quantitatively shown how it affects Rosenbluth and polarization transfer methods. The contribution of an axial meson is negligible in comparison with the traditional box-type two photon exchange and could not be responsible for difference of form factors extracted by different techniques. However, results support the idea that meson exchange could explain deviation of individual polarizations.

21 pages, 9 figures

References in corpus (4)

• Search for effects beyond the Born approximation in polarization transfer observables in $\vec{e}p$ elastic scattering
• The contribution of axial-vector mesons to hyperfine structure of muonic hydrogen
• Contribution of σ-meson exchange to elastic lepton-proton scattering
• On radiative corrections to polarization observables in electron-proton scattering