Determination of the strange-quark mass from QCD pseudoscalar sum rules

A new determination of the strange-quark mass is discussed, based on the tw o-point function involving the axial-vector current divergences. This Green function is known in perturbative QCD up to order O(alpha(s)(3)), and up t o dimension-six in the non- perturbative domain. The hadronic spectral func tion is parametrized in terms of the kaon pole, followed by its two radial excitations, and normalized at threshold according to conventional chiral-s ymmetry. The result of a Laplace transform QCD sum rule analysis of this tw o-point function is: ($) over bar(s)(1 GeV2) = 155 +/- 25 M eV.