论文标题
$ e^+ e^ - \ to k^+ k^ - π^0 $横截面的测量
Measurement of the $e^+e^- \to K^+ K^- π^0$ cross section with the SND detector
论文作者
论文摘要
该过程$ e^+e^ - \ to k^+k^-π^0 $在vepp-2000 $ e^+e^ - $ collider上使用SND检测器进行了研究。基于26.4〜pb $^{ - 1} $的集成光度的数据，我们测量了$ e^+e^ - \ to K^+k^-π^0 $横截面的质量中心能量范围为1.28至2 GEV。 $kπ$系统的测量质谱表明，该反应的主要机制是通过$ k^{\ ast}（892）K $中间状态的过渡。 $ ϕπ^0 $中间状态的横截面分别测量。 SND结果与Babar实验中先前的测量结果一致，并且具有可比的精度。我们研究$ ϕπ^0 $和$ k^\ ast k $振幅之间的干扰效果。发现干扰对测量的$ e^+e^ - \ to ϕπ^0 \至k^+k^-π^0 $横截面1.7 GEV的$ E^+e^ - \给出了相当大的贡献。
The process $e^+e^-\to K^+K^-π^0$ is studied with the SND detector at the VEPP-2000 $e^+e^-$ collider. Basing on data with an integrated luminosity of 26.4~pb$^{-1}$ we measure the $e^+e^-\to K^+K^-π^0$ cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $Kπ$ system indicates that the dominant mechanism of this reaction is the transition through the $K^{\ast}(892)K$ intermediate state. The cross section for the $ϕπ^0$ intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the $ϕπ^0$ and $K^\ast K$ amplitudes. It is found that the interference gives sizable contribution to the measured $e^+e^- \to ϕπ^0\to K^+K^-π^0$ cross section below 1.7 GeV.
