Measurements of Ke4 and K+- -> pi0 pi0 pi+- decays

Details Measurements of Ke4 and K+- -> pi0 pi0 pi+- decays Measurements of Ke4 and K+- -> pi0 pi0 pi+- decays

2006-10-24

arxiv.org/abs/hep-ex/0610071v2

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at the ICHEP06 conference; v2: Corrected reference page and typo

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.

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