Wigner-Cusp in Kaon Decays and Determination of pi pi Scattering Lengths
High Energy Physics - Experiment
2008-11-26 v2
Abstract
In the last few years it has become possible to study low energy pi pi scattering in kaon decays to three pions, thanks to the high statistics measurement of K+- -> pi+- pi0 pi0 decays performed by the NA48/2 experiment at the CERN SPS. At the pi+ pi- threshold, the pi0 pi0 mass spectrum exhibits a Wigner-cusp, from which the S-wave pi pi scattering lengths are extracted with high precision. This measurement is complementary to the extraction of the scattering lengths from K_e4 decays, which is also performed by the NA48/2 experiment.
Cite
@article{arxiv.0712.0544,
title = {Wigner-Cusp in Kaon Decays and Determination of pi pi Scattering Lengths},
author = {Rainer Wanke},
journal= {arXiv preprint arXiv:0712.0544},
year = {2008}
}
Comments
10 pages, proceedings of plenary talk at MENU 2007, FZ Juelich, Sep 2007 (final version after referee's comments)