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V-A Hadronic Tau Decays: a Laboratory for the QCD Vacuum ![]() Auteur(s): Narison S.
(Article) Publié:
Physics Letters B, vol. 624 p.223 - 232 (2005)
Texte intégral en Openaccess : Ref HAL: hal-00266461_v1 Ref Arxiv: hep-ph/0412152 DOI: 10.1016/j.physletb.2005.08.007 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 77 citations Résumé: 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. |