Chiral low-energy constants from tau data
High Energy Physics - Phenomenology
2014-11-20 v1 High Energy Physics - Lattice
Abstract
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).
Cite
@article{arxiv.0910.2264,
title = {Chiral low-energy constants from tau data},
author = {M. Gonzalez-Alonso and A. Pich and J. Prades},
journal= {arXiv preprint arXiv:0910.2264},
year = {2014}
}
Comments
Proceedings of the 6th International Workshop on Chiral Dynamics (Bern, Switzerland, July 6-10, 2009). 9 pages, 3 figures