Approximating chiral SU(3) amplitudes
Abstract
We construct large-N_c motivated approximate chiral SU(3) amplitudes of next-to-next-to-leading order. The amplitudes are independent of the renormalization scale. Fitting lattice data with those amplitudes allows for the extraction of chiral coupling constants with the correct scale dependence. The differences between approximate and full amplitudes are required to be at most of the order of N^3LO contributions numerically. Applying the approximate expressions to recent lattice data for meson decay constants, we determine several chiral couplings with good precision. In particular, we obtain a value for F_0, the meson decay constant in the chiral SU(3) limit, that is more precise than all presently available determinations.
Keywords
Cite
@article{arxiv.1310.8452,
title = {Approximating chiral SU(3) amplitudes},
author = {G. Ecker and P. Masjuan and H. Neufeld},
journal= {arXiv preprint arXiv:1310.8452},
year = {2015}
}
Comments
19 pages, 4 figures, improved presentation, results unchanged, version to appear in EPJC