Chiral low-energy constants from tau data

Details Chiral low-energy constants from tau data Chiral low-energy constants from tau data

2009-10-12

arxiv.org/abs/0910.2264v1

PoS CD09:086,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceedings of the 6th International Workshop on Chiral Dynamics (Bern, Switzerland, July 6-10, 2009). 9 pages, 3 figures

Scientific paper

We analyze how the 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 (ChPT), can be used to improve the knowledge of some of the low-energy constants of ChPT. In particular we find the most precise values of L_{9,10} (or equivalently l_{5,6}) at order p^4 and p^6 and the first phenomenological determination of C_87 (c_50).

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