Chiral low-energy constants L_10 and C_87 from hadronic tau decays

Details Chiral low-energy constants L_10 and C_87 from hadronic tau decays Chiral low-energy constants L_10 and C_87 from hadronic tau decays

2008-10-14

arxiv.org/abs/0810.2459v2

Nucl.Phys.Proc.Suppl.186:171-174,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures. Included in the proceedings of the 14th International QCD Conference, July 2008 Montpellier (France)

Scientific paper

10.1016/j.nuclphysbps.2008.12.04

Using 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.

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