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

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

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- decay...

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Veröffentlicht in:arXiv.org 2007-06
1. Verfasser: Balev, Spasimir
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CP violation
Decay
Physics - High Energy Physics - Experiment
Synchrotrons
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description 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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subjects CP violation
Decay
Physics - High Energy Physics - Experiment
Synchrotrons
title Search for direct CP-violation in K+- --> 3pi decays by NA48/2
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