On the pion decay constant
High Energy Physics - Phenomenology
2011-03-28 v1
Abstract
The pion decay constant f_pi plays a crucial role in many areas of low energy particle physics. Its value may e.g. be deduced from experimental data on leptonic pion decays. Here, we provide comments on several aspects of this evaluation. In particular, we point out that at the present level of experimental accuracy, the value of f_pi is sensitive to the value of the pion mass chosen in its chiral expansion.
Cite
@article{arxiv.1008.3479,
title = {On the pion decay constant},
author = {J. Gasser and G. R. S. Zarnauskas},
journal= {arXiv preprint arXiv:1008.3479},
year = {2011}
}
Comments
15 pages, 3 figures. Accepted for publication in Phys. Lett. B