Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-09
JHEP 0401:055,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 18 ps figures
Scientific paper
10.1088/1126-6708/2004/01/055
The spectral function $\rho_{V-A}(s)$ is determined from ALEPH and OPAL data on hadronic tau decays using a neural network parametrization trained to retain the full experimental information on errors, their correlations and chiral sum rules: the DMO sum rule, the first and second Weinberg sum rules and the electromagnetic mass splitting of the pion sum rule. Nonperturbative QCD vacuum condensates can then be determined from finite energy sum rules. Our method minimizes all sources of theoretical uncertainty and bias producing an estimate of the condensates which is independent of the specific finite energy sum rule used. The results for the central values of the condensates $O_6$ and $O_8$ are both negative.
Latorre Jose I.
Rojo Joan
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