标题： 寻找K\pm \to 3π\pm 衰变中的直接CP破坏 显示英文标题

标题： Search for direct CP violation in the decays K\pm \to 3π\pm

摘要： 我们报告了通过CERN超级质子同步加速器（SPS）上的NA48/2实验对带电K介子衰变中的直接CP破坏不对称参数$A_g$的测量结果$K^\pm\to\pi^\pm\pi^+\pi^-$。该实验的设计目的是不对称测量的系统误差受限。 利用2003年运行期间收集的$1.67\times 10^9$个此类衰变事件，Dalitz图线性斜率参数$g$的电荷不对称性被测量为$A_g=(1.7\pm2.9)\times 10^{-4}$。结果的精度受到所用统计量的限制。 显示英文摘要

摘要： We report a measurement of the direct CP violation asymmetry parameter $A_g$ in charged kaon decays $K^\pm\to\pi^\pm\pi^+\pi^-$ by the NA48/2 experiment at the CERN SPS. The experiment has been designed not to be limited by systematics in the asymmetry measurement. Using $1.67\times 10^9$ such decays collected during the 2003 run, the charge asymmetry in the Dalitz plot linear slope parameter $g$ has been measured to be $A_g=(1.7\pm2.9)\times 10^{-4}$. The precision of the result is limited by the statistics used.