Justifying the exotic Theta+ pentaquark

TL;DR

This paper discusses the theoretical justification for the existence of the exotic Theta+ pentaquark using Quantum Field Theory, the Skyrme model, and a new mean field approach linking it to known resonances.

Contribution

It introduces a new mean field approach that explains Theta+ as arising from known baryon resonances, providing a novel theoretical perspective.

Findings

Theta+ exists in the Skyrme model but is overestimated

The new mean field approach links Theta+ to Lambda(1405), N(1440), and N(1535)

Theoretical models support the existence of Theta+ as a baryon resonance

Abstract

The existence of a light S=+1 baryon resonance follows from Quantum Field Theory applied to baryons. This is illustrated in the Skyrme model (where Theta+ exists but is too strong) and in a new mean field approach where Theta+ arises as a consequence of three known resonances: Lambda(1405), N(1440) and N(1535).