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- W2265028144 abstract "The vector and axial-vector ALEPH hadronic spectral functions from $tau$-decay are used to probe potential quark-hadron duality violations (DV). This is done in the framework of finite energy QCD sum rules (FESR). A pinched integration kernel is introduced in the FESR in order to (a) quench potential duality violations on the real axis in the complex squared energy $s$-plane, and (b) effectively extend the analysis well beyond the kinematical $tau$-decay end-point where there is no longer data, i.e. in the range $s = 3 - 10 ,{mbox{GeV}}^2$. In the vector channel this procedure is supplemented with actual data from $e^+ e^-$-annihilation into hadrons, above the tau-decay kinematical end-point, with results fully supporting this extension. Very good agreement is obtained between data and two specific pinched FESR. Results from this analysis are confronted with those from a specific model of DV. As the sum rules are well satisfied in both cases within experimental errors, we conclude that possible DV must be buried under the experimental uncertainties. In other words, there seems to be no need for explicit models of DV in this case. Pinched kernels work as well, but with far less free parameters." @default.
- W2265028144 created "2016-06-24" @default.
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- W2265028144 date "2016-02-01" @default.
- W2265028144 modified "2023-10-16" @default.
- W2265028144 title "Tau-decay hadronic spectral functions: probing quark-hadron duality" @default.
- W2265028144 cites W2099316351 @default.
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