From hadronic tau decays to the chiral couplings L_10 and C_87

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Gonzalez-Alonso, M.
Pich, A.
Prades, J.
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A sum rule analysis of the hadronic tau-decay data can be used to determine the low-energy constants L10(mu) and C87(mu). These constants are QCD chiral-order parameters, which appear at order p^4 and p^6, respectively, in the chiral perturbation theory expansion of the V-A correlator. At order p^4 we obtain L10(M_rho) = -(5.22\pm 0.06)10^-3. Including in the analysis the order p^6 contributions, we get L10(M_rho) = -(4.06\pm 0.39)10^-3 and C87(M_rho) = (4.89\pm 0.19)10^-3 GeV^-2.
Comment: 6 pages, 3 figures. Talk given at the 10th International Workshop on Tau Lepton Physics
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High Energy Physics - Phenomenology
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