%0 Journal Article
%T Violation of quark-hadron duality and spectral chiral moments in QCD
%A Gonzalez-Alonso, M.
%A Pich, A.
%A Prades, J.
%J Physical Review D
%D 2010
%V 81
%N 7
%I Amer Physical Soc
%@ 1550-7998
%G English
%F Gonzalez-Alonso_etal2010
%O ISI:000277201900025
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=459), last updated on Wed, 23 Mar 2011 16:06:42 +0000
%X We analyze the spectral moments of the V – A two-point correlation function. Using all known short-distance constraints and the most recent experimental data from tau decays, we determine the lowest spectral moments, trying to assess the uncertainties associated with the so-called violations of quark-hadron duality. We have generated a large number of acceptable spectral functions, satisfying all conditions, and have used them to extract the wanted hadronic parameters through a careful statistical analysis. We obtain accurate values for the chi PT couplings L-10 and C-87, and a realistic determination of the dimension six and eight contributions in the operator product expansion, O-6 = (-5.4(-1.6)(+3.6)) . 10(-3) GeV6 and O-8 = d(-8.9-(12.6)(7.4+)) 10(-3) GeV8, showing that the duality-violation effects have been underestimated in previous literature.
%R 10.1103/PhysRevD.81.074007
%U http://lanl.arxiv.org/abs/1001.2269
%U https://doi.org/10.1103/PhysRevD.81.074007
%P 074007-10pp