Non-perturbative QCD vacuum from e+e-→I=1 hadron data

We estimate the gluon vacuum condensate αs〈F2〉 from the e+e-→I=1 hadron cross-section known below 2 GeV using moment sum rules ratios. We obtain αs〈F2〉= (3.9±1.0)10-2GeV4. We also re-evaluate the contribution of the dimension-six vacuum condensates to the above sum rule and test the factorization hypothesis of the four-quark operator. Useful rules for the evaluation of the dimension-six vacuum condensates contributions are given. © 1984 Springer-Verlag.