Isospin Mixing of Quark Cluster States in the Bag Model

The isospin mixing of quark cluster dibaryon states interpreted within the multi-quark bag model of Maulders, Aerts and de Swart (MAS) will be studied. Dibaryon resonances composed of color-magnetic quark cluster states are predicted to be strongly isospin mixed via the off-diagonal quark cluster color-magnetic interaction. For example, the isospin mixing of two dibaryon ${ }^3P_{0,1,2} $ multiplets identified at 2016- and 2052-MeV are calculated to be strongly mixed. The degeneracy of the two multiplets is completely removed by the off-diagonal interaction whose extracted and calculated strength varies between 60-120 MeV depending on the spin of the multiplet member and reproduces well the identified spectrum of states.