Four-quark state in QCD - art. no. 114021

The spectra of some 0(++) four-quark states, which are composed of (q) over bar q pairs, are calculated in QCD. The light four-quark states are calcul ated using the traditional sum rules while four-quark states containing one heavy quark are computed in HQET. For constructing the interpolating curre nts, different couplings of the color and spin inside the (q) over bar q pa ir are taken into account. It is found that the spin and color combination has Little effect on the mass of the four-quark states.