The masses of the 0(++) and 0(-+) light-quark hybrids using QCD sum rules

We calculate the masses of the light-quark hybrid mesons with the quantum n umbers 0(++) and 0(-+) by using the QCD sum rules. Two kinds of interpolate d currents with the same quantum numbers are employed. We find that approxi mately equal masses are predicted for the 0(++) hybrid state using the diff erent currents, and different masses are obtained for the 0(++) hybrid stat e using the different currents. The prediction depends on the interaction b etween the gluon and the quarks in the low-lying hybrid mesons. The mixing effect on the mass of the light-quark hybrid mesons through the low-energy theorem has also been examined, and it is found that this mixing shifts the masses of the hybrid mesons and the glueball a little.