| Abstract: | In this paper, we study the 0+ nonet mesons as tetraquark states with interpolating currents inspired by the color-magnetic wave function. This wave function
is the eigenfunction of an effective color-magnetic Hamiltonian with the lowest eigenvalue, meaning that the state depicted
by this wave function is the most stable one and is the most probable to be observed in experiments. We perform an OPE calculation
up to dimension-eight condensates and find that the best QCD sum rule is achieved when the current inspired by the color-magnetic
wave function is a proper mixture of the tensor and pseudoscalar diquark-antidiquark bound states. Compared with previous
results, to sigma(600) and kappa(800), our results appear better, due to larger pole contribution. The direct instanton contributions
are also considered, which yields a consistent result with previous OPE results. Finally, we also discuss the h￠ \eta{^\prime} problem as a possible six-quark state. |
