Holographic Baryons : Static Properties and Form Factors from Gauge/String Duality

TL;DR

This paper uses holographic duality to analyze baryon properties, calculating static quantities and form factors that align well with experimental data, and extends analysis to excited baryons within a D4/D8-brane model.

Contribution

It provides a systematic holographic approach to compute baryon static properties and form factors, including excited states, within a D4/D8-brane QCD model, and compares results with experiments.

Findings

Computed charge radii and magnetic moments matching experimental values.

Form factors agree well with empirical data.

Analyzed excited baryons like nd and their couplings.

Abstract

In this paper, we study properties of baryons by using a holographic dual of QCD on the basis of the D4/D8-brane configuration, where baryons are described by a soliton. We first determine the asymptotic behavior of the soliton solution, which allows us to evaluate well-defined currents associated with the U(N_f)_L \times U(N_f)_R chiral symmetry. Using the currents, we compute static quantities of baryons such as charge radii and magnetic moments, and make a quantitative test with experiments. It is emphasized that not only the nucleon but also excited baryons, such as \Delta, N(1440), N(1535) etc., can be analyzed systematically in this model. We also investigate the form factors and find that our form factors agree well with the results that are well-established empirically. With the form factors, the effective baryon-baryon-meson cubic coupling constants among their infinite towers in the model can be determined. Some physical implications following from these results are discussed.