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arXiv · hep-ph/9409371

Mass singularities in light quark correlators: the strange quark case

K. G. Chetyrkin·C. A. Dominguez·D. Pirjol·K. Schilcher
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Abstract

The correlators of light-quark currents contain mass-singularities of the form log(m^2/Q^2). It has been known for quite some time that these mass- logarithms can be absorbed into the vacuum expectation values of other operators of appropriate dimension, provided that schemes without normal- ordering are used. We discuss in detail this procedure for the case of the mass logarithms m^4 log(m^2/Q^2), including also the mixing with the other dimension-4 operators to two-loop order. As an application we present an improved QCD sum rule determination of the strange-quark mass. We obtain m_s(1 GeV)=171 \pm 15 MeV.

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K. G. Chetyrkin, C. A. Dominguez, D. Pirjol, K. Schilcher. 1994-09-21. Mass singularities in light quark correlators: the strange quark case. https://doi.org/10.1103/physrevd.51.5090

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