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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

dc.contributor.author	González Alonso, Martín
dc.contributor.author	Pich Zardoya, Antonio
dc.contributor.author	Prades Hernández, Joaquim
dc.date.accessioned	2015-02-27T11:47:45Z
dc.date.available	2015-02-27T11:47:45Z
dc.date.issued	2010
dc.identifier.uri	http://hdl.handle.net/10550/42511
dc.description.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 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.
dc.language.iso	eng
dc.relation.ispartof	Physical Review D, 2010, vol. 81, num. 7, p. 074007
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	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
dc.subject	Física
dc.title	Violation of quark-hadron duality and spectral chiral moments in QCD
dc.type	info:eu-repo/semantics/article
dc.date.updated	2015-02-27T11:47:45Z
dc.identifier.doi	http://dx.doi.org/10.1103/PhysRevD.81.074007
dc.identifier.idgrec	061492