Hadron Form Factors in AdS/QCD

TL;DR

This paper explores the calculation of meson form factors using a holographic QCD model, revealing that mesons are more compact in gravitational form factors than in electromagnetic ones.

Contribution

It introduces a holographic approach to compute various meson form factors, including gravitational and electromagnetic, highlighting differences in meson size measurements.

Findings

Mesons are more compact in gravitational form factors.

Holographic methods effectively compute meson form factors.

Differences in meson size depend on the type of form factor measured.

Abstract

We discuss how to calculate form factors using a holographic model of QCD, mainly focusing on vector, axial, and pseudoscalar mesons. We illustrate the techniques on gravitational form factors (which are useful for constraining the generalized parton distributions) as well as quoting the results for electromagnetic form factors. One striking outcome, comparing the several types of calculated form factors, is that mesons appear noticeably more compact when measured by the gravitational form factors than when measured by the charge form factor.