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Abstract
The strange quark mass is calculated from QCD sum rules for the divergence of the vector as well as axialvector current in the next-next-to-leading logarithmic approximation. The determination for the divergence of the axial-vector current is found to be unreliable due to large uncertainties in the hadronic parametrisation of the two-point function. From the sum rule for the divergence of the vector current, we obtain a value of $$m_s \equiv \bar m_s$$ (1 GeV)=189±32 MeV, where the error is dominated by the unknown perturbativeO(α s 3 ) correction. Assuming a continued geometric growth of the perturbation series, we findm s =178±18 MeV. Using both determinations ofm s , together with quark-mass ratios from chiral perturbation theory, we also give estimates of the light quark massesm u andm d.
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