On the QCD sum rule determination of the strange quark mass

In the QCD sum rule determination of m s using the two-point correlator of divergences of ΔS = 1 vector currents, the final uncertainty on m s is mainly due to the hadronic spectral function. Using a specific parameterization which fully takes into account the available experimental data on the Kπ (...

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Bibliographic Details
Published in:Physics letters. B 1997-09, Vol.408 (1), p.340-346
Main Authors: Colangelo, P., De Fazio, F., Nardulli, G., Paver, N.
Format: Article
Language:English
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Summary:In the QCD sum rule determination of m s using the two-point correlator of divergences of ΔS = 1 vector currents, the final uncertainty on m s is mainly due to the hadronic spectral function. Using a specific parameterization which fully takes into account the available experimental data on the Kπ ( I = 1 2 , J P = 0 + system, characterized by the presence of a relevant nonresonant component in addition to the resonant one, we find m s(1 GeV) ⩾ 120 MeV . In particular, varying only the parameters describing the nonresonant Kπ component and Λ MS n f=3 we obtain m s(1 GeV) = 125–160 MeV . This result is smaller than analogous ones obtained by using a parameterization in terms of only resonant states. We discuss how to systematically improve the determination of m s by this method.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(97)00751-X