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Résumé du preprint DAPNIA-07-146

DAPNIA-07-146

RECENT RESULTS FROM NA48/2 ON Ke4 AND K3pi DECAYS, INTERPRETATION IN TERMS OF pi-pi SCATTERING LENGTHS

B.Bloch-Devaux

Recent results from the NA48/2 experiment at the CERN/SPS are presented. 
Large samples of Ke4 decays have been collected in 2003 and 2004 in 
the charged (K+- --> pi+ pi- e+- nu) and neutral (K+- --> pi0 pi0 e+- nu) modes. 
Form factors and branching fraction measurements are reported. 
The pi pi scattering lengths a00 and a02 can be extracted from 
the charged Ke4 phase shift delta and  also from the cusp in 
the Mpi0pi0 distribution of K+- -->Pi0 pi0 pi+- decays.

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