A Dispersive Treatment of $K_{\ell4}$ Decays
High Energy Physics - Phenomenology
2017-08-23 v1 High Energy Physics - Experiment
Nuclear Theory
Abstract
are for several reasons an especially interesting decay channel of mesons: decays allow an accurate measurement of a combination of -wave scattering lengths, one form factor of the decay is connected to the chiral anomaly and the decay is the best source for the determination of some low energy constants of ChPT. We present a dispersive approach to decays, which takes rescattering effects fully into account. Some fits to NA48/2 and E865 measurements and results of the matching to ChPT are shown.
Keywords
Cite
@article{arxiv.1209.0755,
title = {A Dispersive Treatment of $K_{\ell4}$ Decays},
author = {Gilberto Colangelo and Emilie Passemar and Peter Stoffer},
journal= {arXiv preprint arXiv:1209.0755},
year = {2017}
}
Comments
4 pages, talk given by PS at MESON2012 - 12th International Workshop on Meson Production, Properties and Interaction, Krak\'ow, Poland, 31 May - 5 June 2012