Mass singularities in light quark correlators: the strange quark case

Details Mass singularities in light quark correlators: the strange quark case Mass singularities in light quark correlators: the strange quark case

1994-09-21

arxiv.org/abs/hep-ph/9409371v1

Phys.Rev. D51 (1995) 5090-5100

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, Latex + 5 figures as uuencoded PS files, MZ-TH/94-21, UCT-TP 214/94

Scientific paper

10.1103/PhysRevD.51.5090

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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