Cusps in eta' --> eta pi pi decays
Abstract
The discovery of the cusp effect in the decay K+ --> pi+ pi0 pi0 has spurred the search for other decay channels, where this phenomenon, which is generated by strong final-state interactions, should also occur. A very promising candidate is eta' --> eta pi0 pi0. The cusp effect offers an excellent opportunity to experimentally extract pi pi S-Wave scattering lengths. We adapt and generalize the non-relativistic effective field theory framework developed for K --> 3 pi decays to eta' --> eta pi pi. The cusp effect is predicted to have an effect of more than 8 % on the decay spectrum below the pi+ pi- threshold. We also show that with our current theoretical information about eta' --> eta pi pi decays, it is not possible to extract pi eta threshold parameters.
Keywords
Cite
@article{arxiv.0910.0200,
title = {Cusps in eta' --> eta pi pi decays},
author = {Sebastian P. Schneider and Bastian Kubis},
journal= {arXiv preprint arXiv:0910.0200},
year = {2014}
}
Comments
4 pages, 2 figures, Proceedings for the 6th International Workshop on Chiral Dynamics, Bern, Switzerland, July 6-10, 2009