Stability of the pentaquark in a naive string model

TL;DR

This paper investigates the stability of the pentaquark using a simplified string model of confinement, demonstrating its stability against dissociation into meson and baryon configurations.

Contribution

It introduces a naive string model approach to analyze pentaquark stability, neglecting Coulomb, spin, and antisymmetrization effects.

Findings

Pentaquark is stable in the model against dissociation.

Stability holds for equal-mass constituents and static quark or antiquark cases.

Model simplifies confinement to flux tubes of minimal length.

Abstract

The pentaquark is studied in a simple model of confinement where the quarks and the antiquark are linked by flux tubes of minimal cumulated length, and the Coulomb-like interaction, the spin-dependent terms and the antisymmetrization constraints are neglected.. The ground-state is found to be stable against spontaneous dissociation into a meson and a baryon, both in the case of five equal-mass constituents and for a static quark or antiquark surrounded by four equal masses.