Search for direct CP violating charge asymmetries in K+- --->pi+- pi+ pi- and K+- --->pi+- pi0 pi0 decays

A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes Ag=(g+-g-)/(g ++g-) in K±→π ±π+π- and K ±→π±π0π 0 decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous K+ and K- beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be A c g=(-1.5±2.2)×10-4 with 3.11×109K±→π±π +π- decays, and An g=(1. 8±1.8)×10-4 with 9.13×107K ±→π±π0π 0 decays. The precision of the results is limited mainly by the size of the data sample.