Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy

Details Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy

2005-12-22

arxiv.org/abs/hep-ph/0512295v2

Eur.Phys.J.C46:721-728,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Few misprints corrected, version to appear in European Physics Journal C. 15 pages, the complete paper is also available via t

Scientific paper

10.1140/epjc/s2006-02508-8

We include the new, five-loop, O(alpha_s^4) correction into the QCD sum rule used for the s-quark mass determination. The pseudoscalar Borel sum rule is taken as a study case. The OPE for the correlation function with N^4LO, O(alpha_s^4) accuracy in the perturbative part, and with dimension <= 6 operators reveals a good convergence. We observe a significant improvement of stability of the sum rule with respect to the variation of the renormalization scale after including the O(alpha_s^4) correction. We obtain the interval m_s(2 GeV)=105 \pm 6 \pm 7 MeV, which exhibits about 2 MeV increase of the central value, if the O(alpha_s^4) terms are removed.

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