The electromagnetic form factors in the $N_{f}=4$ holographic QCD

TL;DR

This paper uses a modified holographic QCD model with four flavors to analyze meson spectra, decay constants, and electromagnetic form factors, achieving good agreement with experimental and lattice data across various mesons.

Contribution

It introduces a four-flavor holographic model to comprehensively study meson properties, including spectra, decay constants, and form factors, with comparisons to experimental and lattice results.

Findings

Good agreement with experimental data for kaon form factors at low Q^2

Lattice QCD data consistent for D and D_s electromagnetic form factors

Predictions for form factors of various vector and axial mesons

Abstract

In this study, we employ a modified soft-wall holographic model with four flavors to investigate the meson spectra, decay constants, electromagnetic form factors, and charge radius of various mesons. We obtain the spectra for vector, axial vector, and pseudoscalar mesons. Decay constants are calculated and compared with experimental and lattice QCD data. The pion and kaon electromagnetic form factors are compared with the experimental data, and a good agreement is achieved for the kaon at low $Q^{2}$. For the charmed mesons, the electromagnetic form factors of the $D$ and $D_{s}$ and electric form factors of the $D^{*}$ and $D_{s}^{*}$ are well consistent with the lattice QCD data. Moreover, the electric, magnetic, and quadrupole form factors are predicted for the $\rho$, $K^{*}$, $a_1$, $K_1$, $D_1$, and $D_{s1}$ mesons. Furthermore, the charge radius of the vector, axial vector, and pseudoscalars, including the strange and charmed mesons, are computed.