Violation of Quark-Hadron Duality and Spectral Chiral Moments in QCD

Details Violation of Quark-Hadron Duality and Spectral Chiral Moments in QCD Violation of Quark-Hadron Duality and Spectral Chiral Moments in QCD

2010-01-13

arxiv.org/abs/1001.2269v2

Phys.Rev.D81:074007,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pp, slightly modified version to be published in PRD.

Scientific paper

10.1103/PhysRevD.81.074007

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 GeV^6 and O8=(-8.9^{+12.6}_{-7.4})*10^-3 GeV^8, showing that the duality-violation effects have been usually underestimated in previous literature.

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