TY - JOUR
T1 - Mass singularities in light quark correlators
T2 - The strange quark case
AU - Chetyrkin, K. G.
AU - Dominguez, C. A.
AU - Pirjol, D.
AU - Schilcher, K.
PY - 1995
Y1 - 1995
N2 - The correlators of light-quark currents contain mass singularities of the form ln(m2/Q2). 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 m4ln(m2/Q2), 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 m̄s(1 GeV)=171±15 MeV.
AB - The correlators of light-quark currents contain mass singularities of the form ln(m2/Q2). 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 m4ln(m2/Q2), 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 m̄s(1 GeV)=171±15 MeV.
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U2 - 10.1103/PhysRevD.51.5090
DO - 10.1103/PhysRevD.51.5090
M3 - Article
AN - SCOPUS:4243705542
SN - 0556-2821
VL - 51
SP - 5090
EP - 5100
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 9
ER -