Order-${\alpha }_s^3$ determination of the strange quark mass

Abstract

We present a QCD sum rule calculation of the strange-quark mass including four-loop QCD corrections to the correlator of scalar currents. We obtain ${\bar{m}}_s(1$ GeV$)=205.5\pm 19.1$ MeV.

Comments: 14 pages LaTex with 2 figures. Updated version including the recently computed 4-loop beta and gamma functions