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Chiral low-energy constants L10 and C87 from hadronic τ decays

AuthorsGonzález-Alonso, Martín ; Piedra, Antonio; Prades, Joaquim
Issue DateJan-2009
CitationNuclear Physics B Proceedings Supplements 186: 171-174 (2009)
AbstractUsing recent precise hadronic tau-decay data on the V-A spectral function and general properties of QCD such as analyticity, the operator product expansion and chiral perturbation theory, we get accurate values for the QCD chiral order parameters L_10 and C_87. At order p^4 we obtain L_10^r(M_rho)=-(5.22+-0.06)10^-3, whereas at order p^6 we get L_10^r(M_rho)=-(4.06+-0.39)10^-3 and C_87^r(M_rho) = (4.89+-0.19)10^-3 GeV^-2.
Description4 páginas, 1 figura.-- Comunicación presentada a la 14ª High-Energy Physics International Conference On Quantum ChromoDynamics (QCD), celebrada en Julio de 2008 en Montpellier (Francia).-- arXiv:0810.2459v2.
Publisher version (URL)http://dx.doi.org/10.1016/j.nuclphysbps.2008.12.040
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