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Determination of f(0) - a(0)(0) mixing angle from QCD sum rules

By assuming that the f(0) and a(0)(0) mesons are mixed states of the two-quark-tetraquark, the mixing angle between them is estimated within the QCD sum rules method, and it is obtained that the mixing angle is (6.03 +/- 0.08)degrees. Our prediction on the mixing angle can be checked in further experiments which can shed light on choosing the "right" structure of f(0) and a(0)(0) mesons.