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 $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ 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 $A_g=(-1.3\pm 2.3)\times 10^{-4}$ has been obtained with a sample of $3.11\times 10^9$ selected events corresponding to the full collected statistics. The precision of the result is limited by the statistics used.

arXiv commentA talk given at "Les Rencontres de Physique de la Vallee d'Aoste 2006", La Thuile, March 2006. 14 pages, 2 figures