Soliton–skyrmion in the extended chiral group $E\chi$ including diquark parameters

We consider the extended chiral group $E\chi$ and investigate whether solitons–skyrmions can be formed by the chiral field with diquark parameters in the symplectic subgroup of $E\chi$. We find that isolated solitons {(}i.e., solitons in the gluonic vacuum{\rm)} can be stable in the chromomagnetic vacuum and their topological charge starts from $\pm4/3$.