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在$K^\pm\toπ^\pmπ^+π^-$和$K^\pm\toπ^\pmπ^0π^0$衰变中寻找直接破坏电荷不对称性的CP

Search for direct CP violating charge asymmetries in $K^\pm\toπ^\pmπ^+π^-$ and $K^\pm\toπ^\pmπ^0π^0$ decays

J. R. Batley

备注：
29 pages, 9 figures. An updated version accepted by the EPJC
发表信息：
Eur.Phys.J.C52:875-891,2007
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摘要：

本文介绍了在CERN SPS的NA 48/2实验上测量的$K^\pm\toπ^\pmπ^+π^-$和$K^\pm\toπ^\pmπ^0π^0$衰变中Dalitz图线性斜率$A_g=(g^+-g^-)/(g^++g^-)$的直接CP破坏电荷不对称性。一种新的不对称测量技术，涉及同时$K^+$和$K^-$光束和收集的大数据样本，允许前所未有的精度结果。测量的电荷不对称性为$A^c_g=(-1.5\pm2.2)\times10^{-4}$与$3.11\times 10^9$ $K^{\pm}\toπ^\pmπ^+π^-$衰变，以及$A^n_g=(1.8\pm1.8)\times10^{-4}$与$9.13\times 10^7$ $K^{\pm}\toπ^\pmπ^0π^0$衰变。结果的精确度主要受到数据样本大小的限制。

英文摘要：

A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes $A_g=(g^+-g^-)/(g^++g^-)$ in $K^\pm\toπ^\pmπ^+π^-$ and $K^\pm\toπ^\pmπ^0π^0$ decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous $K^+$ and $K^-$ beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be $A^c_g=(-1.5\pm2.2)\times10^{-4}$ with $3.11\times 10^9$ $K^{\pm}\toπ^\pmπ^+π^-$ decays, and $A^n_g=(1.8\pm1.8)\times10^{-4}$ with $9.13\times 10^7$ $K^{\pm}\toπ^\pmπ^0π^0$ decays. The precision of the results is limited mainly by the size of the data sample.

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