The quark condensate from K_{e_4} decays
High Energy Physics - Phenomenology
2009-07-09 v1
Abstract
We show that, independently of the size of the quark condensate, chiral symmetry correlates the two S-wave \pi\pi scattering lengths. In view of this constraint, the new precision data on K_{e_4} decay allow a remarkably accurate determination of these quantities. The result confirms the hypothesis that the quark condensate is the leading order parameter.
Keywords
Cite
@article{arxiv.hep-ph/0103063,
title = {The quark condensate from K_{e_4} decays},
author = {G. Colangelo and J. Gasser and H. Leutwyler},
journal= {arXiv preprint arXiv:hep-ph/0103063},
year = {2009}
}
Comments
4 pages (LaTex), 3 figures