Low Energy Constants from Kl4 Form-Factors
High Energy Physics - Phenomenology
2009-10-31 v2
Abstract
We have calculated the form-factors F and G in K ---> pi pi e nu decays (Kl4) to two-loop order in Chiral Perturbation Theory (ChPT). Combining this together with earlier two-loop calculations an updated set of values for the L's, the ChPT constants at p^4, is obtained. We discuss the uncertainties in the determination and the changes compared to previous estimates.
Keywords
Cite
@article{arxiv.hep-ph/9912398,
title = {Low Energy Constants from Kl4 Form-Factors},
author = {G. Amorós and J. Bijnens and P. Talavera},
journal= {arXiv preprint arXiv:hep-ph/9912398},
year = {2009}
}
Comments
6 pages, uses axodraw.sty, 2 figures, bug in program corrected, new numerical results