V-A hadronic tau decays : a laboratory for the QCD vacuumReport as inadecuate



 V-A hadronic tau decays : a laboratory for the QCD vacuum


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ALEPH-OPAL data on the V-A spectral functions from hadronic tau decays are used in connection with a set of Laplace transform sum rules LSR for fixing the size of the QCD vacuum condensates up to dimension 18. Our results favour the ones from large-N c QCD within the Minimal Hadronic Approximation MHA and show a violation of about a factor 2-5 of the vacuum saturation estimate of the dimension-six to -ten condensates. We scrutinize the different determinations of the QCD vacuum condensates using tau-decays data. After revisiting some of the existing results, we present coherent values of the condensates from different methods.



Author: Stephan Narison

Source: https://archive.org/







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