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

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

2007-05-29

arxiv.org/abs/0705.4180v2

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at XXXIII International Conference on High Energy Physics (ICHEP'06), Moscow, Russia, July 26 - August 2, 2006

Scientific paper

A high precision search for direct CP-violation in K+- --> 3 pi decays was performed by the NA48/2 experiment at CERN SPS. The asymmetry in the Dalitz plot 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. The unique double- beam system, the design of the detectors and the method of analysis provide good control of the instrumental charge asymmetries and allow to keep the precision of the result limited by statistics, reaching accuracy one order of magnitude better than in previous experiments.

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