Axial meson contribution to proton form factors
Nikolai Korchagin, Andrey Radzhabov
TL;DR
This paper investigates the impact of axial meson exchange, specifically the $f_1(1285)$, on proton form factor extraction methods, finding it negligible compared to two-photon exchange but potentially relevant for polarization deviations.
Contribution
It provides a quantitative analysis of axial meson exchange effects on proton form factors, clarifying its limited role relative to other known effects.
Findings
Axial meson exchange has negligible effect compared to two-photon exchange.
Meson exchange may explain deviations in polarization measurements.
No significant impact on Rosenbluth method results.
Abstract
The effect of axial meson exchange on extraction of proton electromagnetic form factors in scattering is calculated. Taking as an example 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.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Advanced NMR Techniques and Applications · Particle physics theoretical and experimental studies