System Energies for Pentaquark Family Using Thomas-Fermi Quark Model

TL;DR

This paper uses the Thomas-Fermi quark model to calculate energies of pentaquark families, revealing stable configurations like the icosaquark with potential implications for multiquark state stability.

Contribution

It introduces a novel application of the Thomas-Fermi model to multiquark systems, identifying stable pentaquark configurations and the concept of icosaquarks.

Findings

Stable multiquark configurations with multiples of four pentaquarks identified.

Lowest energy per quark found in the icosaquark system.

Discontinuity in light quark density favored energetically.

Abstract

This study calculates the system energies of families of pentaquarks, $uudc\bar{c}$, starting from 5 quarks up to 70 using Thomas-Fermi statistical quark model. The model assumes spherical symmetry with the particles continuously distributed with varying densities and boundaries. The particles interact with Coulombic forces and a discontinuity in the light quark density function is energetically favored. Total energies of the system are calculated for each multiquark system and compared to determine family stability characteristics. A remarkable stability for multiquark combinations with multiples of four pentaquarks, which we term an icosaquark, is identified. The first icosaquark system is found to have lowest energy per quark, suggesting stability of a system consisting of four charm, four anticharm and twelve light quarks.