Holographic QCD for H-dibaryon (uuddss)

TL;DR

This paper explores the H-dibaryon within holographic QCD, modeling it as a topological soliton and estimating its mass to be around 1.7 GeV, which is below twice the nucleon mass.

Contribution

It is the first study of the H-dibaryon in holographic QCD, deriving its effective theory and estimating its mass as a topological soliton.

Findings

H-dibaryon modeled as an SO(3) topological soliton with B=2

Estimated H-dibaryon mass is approximately 1.7 GeV

H-dibaryon mass is about twice the B=1 baryon mass

Abstract

The H-dibaryon (uuddss) is studied in holographic QCD for the first time. In holographic QCD, four-dimensional QCD, i.e., SU($N_c$) gauge theory with chiral quarks, can be formulated with $S^1$-compactified D4/D8/$\overline{\rm D8}$-brane system. In holographic QCD with large $N_c$, all the baryons appear as topological chiral solitons of Nambu-Goldstone bosons and (axial) vector mesons, and the H-dibaryon can be described as an SO(3)-type topological soliton with $B=2$. We derive the low-energy effective theory to describe the H-dibaryon in holographic QCD. The H-dibaryon mass is found to be twice of the $B=1$ hedgehog-baryon mass, $M_{\rm H} \simeq 2.00 M_{B=1}^{\rm HH}$, and is estimated about 1.7GeV, which is smaller than mass of two nucleons (flavor-octet baryons), in the chiral limit.