%0 Conference Proceedings
%T The SVZ-Expansion and Beyond
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Narison, S.
%Z 7 pages in 2-column format, 1 figure, 4 tables, Talk given at the Workshop Understanding Confinement (Ringberg Castle, 16-21th May 2005) and at QCD 05 International Conference (Montpellier, 4-8th July 2005)
%< avec comité de lecture
%( Nuclear Physics B Proceedings Supplements
%B 12th High-Energy Physics International Conference on Quantum ChromoDynamics, QCD05
%C Montpellier, France
%Y S. Narison
%I Elsevier
%V 164
%P 225-231
%8 2005-07-04
%D 2005
%Z hep-ph/0508259
%R 10.1016/j.nuclphysbps.2006.11.070
%Z Physics [physics]/High Energy Physics - Experiment [hep-ex]
%Z Physics [physics]/High Energy Physics - Lattice [hep-lat]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Theory [hep-th]
%Z Physics [physics]/Nuclear Theory [nucl-th]Conference papers
%X I discuss the standard SVZ-expansion of the QCD two-point correlators in terms of the QCD vacuum condensates and beyond it due to a new unflavoured 1/Q^2-term (tachyonic gluon mass squared \lambda^2) which modelizes the effects of uncalculated higher order perturbative terms. The approach is confronted with low-energy and lattice data. One can notice that, in the different examples studied here, high-dimension condensates are expected to deviate largely from their vacuum saturation (large N_c) values, while the new 1/Q^2-term due to \lambda^2 solves the hadronic mass scale hierarchy-puzzle encountered in the early SVZ-sum rule analysis and improves the low-energy phenomenology. From tau-decay data, one can extract the running strange quark mass m_s(2 GeV)=(93^{+29}_{-32}) MeV and a more accurate value of the QCD coupling \alpha_s(M_Z)=0.117+- 0.002.
%G English
%L in2p3-00025721
%U https://hal.in2p3.fr/in2p3-00025721
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2