The Strange-Quark Mass From QCD Sum Rules: An Update

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 ms/(mu+ md). 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: ms (1 GeV) = 150±70 MeV. 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.