Four-quark state in QCD
Abstract
The spectra of some 0++ four-quark states, which are composed of qq pairs, are calculated in QCD. The light four-quark states are calculated using the traditional sum rules while four-quark states containing one heavy quark are computed in HQET. For constructing the interpolating currents, different couplings of the color and spin inside the qq pair are taken into account. It is found that the spin and color combination has little effect on the mass of the four-quark states.
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