V-A hadronic tau decays : a laboratory for the QCD vacuum
High Energy Physics - Phenomenology
2009-11-10 v2 High Energy Physics - Experiment
High Energy Physics - Lattice
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0412152,
title = {V-A hadronic tau decays : a laboratory for the QCD vacuum},
author = {Stephan Narison},
journal= {arXiv preprint arXiv:hep-ph/0412152},
year = {2009}
}
Comments
Version to appear in Phys. Lett. B