CERN Accelerating science

Article
Report number	hep-ex/0610071
Title	Measurements of $K_{e4}$ and $K^{\pm} \to \pi^{0} \pi^{0} \pi^{\pm}$ decays
Author(s)	Masetti, L. (Mainz U., Inst. Phys.)
Publication	2006
Imprint	24 Oct 2006
Number of pages	6
Note	Manuscript not submitted to the proceedings ICHEP06 Talk given at the ICHEP06 conference; v2: Corrected reference page and typo
In:	10.1142/9789812790873_0102
In:	33rd International Conference on High-Energy Physics, Moscow, Russian Federation, 26 Jul - 2 Aug 2006, pp.543-546
DOI	10.1142/9789812790873_0102
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA48-2
Abstract	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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