Form factors of vector and axial-vector mesons in holographic D4-D8 model

TL;DR

This paper computes electromagnetic form factors, mass spectra, and moments of vector and axial-vector mesons using the holographic D4-D8 model, showing good agreement with QCD and other models.

Contribution

It provides detailed calculations of meson form factors and spectra within the holographic D4-D8 framework, including superconvergence sum rules and polarization-dependent form factors.

Findings

Mass spectra and Regge trajectories match experimental data.

Form factors satisfy superconvergence sum rules.

Results align well with QCD and other holographic models.

Abstract

We calculate elastic and non-elastic electromagnetic form factors for vector and axial-vector mesons in the holographic D4-D8 brane model. We obtain the mass spectrum and Regge trajectories for these particles. From the elastic form factors we extract the electric radius, the magnetic and quadrupole moments. Form factors for transverse and longitudinal polarizations are also obtained. We find superconvergence sum rules for the vector and axial-vector meson couplings that determine the asymptotic behavior of the form factors at large momentum transfer. Our results show good agreement with other holographic models and QCD.