Ke4 decays and Wigner cusp

Details Ke4 decays and Wigner cusp Ke4 decays and Wigner cusp

2007-04-10

arxiv.org/abs/0704.1307v1

ECONFC0610161:008,2006

Physics

High Energy Physics

High Energy Physics - Experiment

Contribution to the proceedings of HQL06, Munich, October 16th-20th 2006

Scientific paper

The NA48/2 experiment at the CERN SPS collected in 2003 and 2004 large samples of the decays K+- -> pi+ pi- e+- nu (Ke4+-), K+- -> pi0 pi0 e+- nu (Ke400) and K+- -> pi0 pi0 pi+-. From the Ke4+- form factors and from the cusp in the M00^2 distribution of the K+- -> pi0 pi0 pi+- events, the pi-pi scattering lengths a00 and a20 could be extracted. This measurement is a fundamental test of Chiral Perturbation Theory (ChPT). The branching fraction and form factors of the Ke400 decay were precisely measured, using a much larger data sample than in previous experiments. An improved measurement of the slope parameters for the decay K+- -> pi0 pi0 pi+- showed evidence for a non-zero value of k.

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