The strange-quark mass from QCD sum rules: An Update

Abstract

Three different ways of determining the strange quark mass using QCD sum rules are reviewed. First, from a QCD sum rule determination of the up and down quark masses, together with the current algebra ratio $m_s/(m_u+m_d)$. Second and third, from QCD sum rules involving the strangeness changing vector and axial-vector current divergences, respectively. Present results are encompassed in the value: $m_s(1GeV)=150\pm 70MeV$. It is argued that until direct, and precision measurements of the relevant spectral functions become available, the above error is not likely to be reduced.

Comments: Invited talk at the XVI International Workshop on Weak Interactions and Neutrinos, WIN 97, Capri, June 1997. To be published in Nucl. Phys. B (Proc. Suppl.), no figures