2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177735The pentaquark state recently discovered has been studied with three quark models which either fit the nucleon spin structure or the $NN$ scattering. A minimum $Θ^+$ mass of 1620 MeV is obtained both for the ${1/2}^\pm$ state. The mixing of various color structure configurations, which would reduce the mass of the penta-quark state, should be taking into account in the calculation of penta-quark mass.14 pages, 7 figuresHigh Energy Physics - Phenomenologytext