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

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

2004-12-13

arxiv.org/abs/hep-ph/0412152v2

Phys.Lett. B624 (2005) 223-232

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.08.007

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.

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