Speaker
Mrs
Brigitte BLOCH-DEVAUX
(DAPNIA/SPP CEA-SACLAY ( FRANCE))
Description
The NA48/2 experiment at the CERN SPS has collected about 10**6
K± decays
into pi+ pi- e± ν (Ke4) in 2003 and 2004. The analysis of a
partial sample of
~500000 such events allows a precise measurement of the decay
parameters.
The form factors of the reaction and their dependence with dipion
and dilepton
masses have been measured. Thanks to a sizeable acceptance at
large Mpipi
and the very good resolution of the NA48 detector, a high
sensitivity to the
pi-pi scattering lengths a00 and a02 is achieved. These almost model
independent measurements can be confronted with the predictions from
different calculations, in particular within the framework of
Chiral Perturbation
Theory.
Primary author
Mrs
Brigitte BLOCH-DEVAUX
(DAPNIA/SPP CEA-SACLAY ( FRANCE))
