High precision study of CP-violating charge asymmetry in K+- --> 3pi+- decays
Abstract
A precise measurement of the direct CP violating charge asymmetry parameter
A
g
in
K
±
→
π
±
π
+
π
−
decays by the NA48/2 experiment at CERN SPS is presented. The experiment has been designed not to be limited by systematic uncertainties in the asymmetry measurement. A preliminary result for the charge asymmetry
A
g
=(−1.3±2.3)×
10
−4
has been obtained with a sample of
3.11×
10
9
selected events corresponding to the full collected statistics. The precision of the result is limited by the statistics used.