Abstract
We present the next-next-to-leading three-loop perturbative QCD corrections to the (pseudo) scalar quark current correlator. They amount to about 20% of the leading term at α s ≈ 0.25 . Taking them into account and exploiting finite energy sum rules, we find the following values of light quark masses: m u ≈ 5 MeV , m d ≈ 11 MeV , m s ≈ 195 MeV . We also discuss the phenomenological predictions of “linear dual models” for radial excitations of the K, δ and κ mesons.
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