Gravitational form factors of the baryon octet in holographic QCD

TL;DR

This paper investigates the gravitational form factors of the baryon octet, including hyperons, using a holographic QCD model that accounts for SU(3) flavor symmetry breaking, providing insights into their internal structure and size variations.

Contribution

It introduces a bottom-up holographic QCD approach incorporating strange quark mass effects to study GFFs of the baryon octet, including hyperons, and compares results with lattice QCD data.

Findings

GFFs vary across the baryon octet.

Gravitational radii decrease with increasing strangeness.

Results align reasonably with lattice QCD for non-strange baryons.

Abstract

The gravitational form factors (GFFs) of the baryon octet, including hyperons, are investigated in a bottom-up holographic QCD model that explicitly incorporates the SU(3) flavor symmetry breaking through the strange quark mass. We fit the model parameters to reproduce the empirical masses of the baryon octet and examine the dependence of GFFs on the probe momentum. Our numerical results show distinct differences in the GFFs across the baryon octet. The computed GFFs are found to be in reasonable agreement with available lattice QCD results for the non-strange/nucleon sector. We also calculate the gravitational radii of the baryon octet and find that they decrease with increasing strangeness, indicating that heavier hyperons are more compact.