Justifying the exotic image pentaquark Original Research Article

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 Θ+ exists but is too strong) and in a new mean field approach where Θ+ arises as a consequence of three known resonances: Λ(1405), N(1440) and N(1535).