Violation of quark-hadron duality and spectral chiral moments in QCD
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Violation of quark-hadron duality and spectral chiral moments in QCD

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Violation of quark-hadron duality and spectral chiral moments in QCD

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González Alonso, Martín; Pich Zardoya, Antonio Perfil; Prades Hernández, Joaquim
This document is a artículoDate2010

Este documento está disponible también en : http://hdl.handle.net/10550/42511
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.

    González Alonso, Martín Pich Zardoya, Antonio Prades Hernández, Joaquim 2010 Violation of quark-hadron duality and spectral chiral moments in QCD Physical Review D 81 7 074007
http://dx.doi.org/10.1103/PhysRevD.81.074007

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