Violation of Quark-Hadron Duality and Spectral Chiral Moments in QCD
Abstract
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 ChPT couplings L10 and C87, and a realistic determination of the dimension six and eight contributions in the operator product expansion, O6=(-5.4+3.6-1.6)*10-3 GeV6 and O8=(-8.9+12.6-7.4)*10-3 GeV8, showing that the duality-violation effects have been usually underestimated in previous literature.