Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-07
Phys.Lett.B408:340-346,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 13 pages, 3 figures
Scientific paper
10.1016/S0370-2693(97)00751-X
In the QCD Sum Rule determination of $m_s$ using the two-point correlator of divergences of $\Delta S=1$ 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 $K \pi$ ($I=1/2, J^P=0^+)$ system, characterized by the presence of a relevant nonresonant component in addition to the resonant one, we find ${\bar m_s}(1 GeV)\ge 120 MeV$. In particular, varying only the parameters describing the nonresonant $K \pi$ component and $\Lambda_{\bar {MS}}^{n_f=3}$ we obtain ${\bar m_s}(1 GeV)=125 - 160 MeV$. 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.
Colangelo Pietro
Fazio Fulvia de
Nardulli Giuseppe
Paver Nello
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