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A high precision search for direct CP-violation in K+- --> 3 pi decays wasperformed by the NA48/2 experiment at CERN SPS. The asymmetry in the Dalitzplot linear slopes A_g = (g^+ - g^-)/(g^+ + g^-) is measured to be A^c_g =(-1.3 +- 2.3)x10^-4 by studying ~3.1x10^9 K+- --> pi+- pi+ pi- decays and A^n_g= (2.1 +- 1.9)x10^-4 by studying ~91x10^6 K+- --> pi+- pi0 pi0 decays. Theunique double- beam system, the design of the detectors and the method ofanalysis provide good control of the instrumental charge asymmetries and allowto keep the precision of the result limited by statistics, reaching accuracyone order of magnitude better than in previous experiments.

Search for direct CP-violation in K+- --> 3pi decays by NA48/2