Chiral low-energy constants L_10 and C_87 from hadronic tau decays
High Energy Physics - Phenomenology
2009-04-30 v2
Abstract
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.
Keywords
Cite
@article{arxiv.0810.2459,
title = {Chiral low-energy constants L_10 and C_87 from hadronic tau decays},
author = {Martin Gonzalez-Alonso and Antonio Pich and Joaquim Prades},
journal= {arXiv preprint arXiv:0810.2459},
year = {2009}
}
Comments
4 pages, 2 figures. Included in the proceedings of the 14th International QCD Conference, July 2008 Montpellier (France)