论文标题
过程的动力学研究$ e^+e^ - \ toπ^+π^-π^0 $在能量范围1.15--2.00 GEV
Study of dynamics of the process $e^+e^-\to π^+π^-π^0$ in the energy range 1.15--2.00 GeV
论文作者
论文摘要
该过程的动力学$ e^+e^ - \ toπ^+π^-π^0 $在能量区域从1.15至2.00 GEV研究，使用与SND检测器在VEPP-2000 $ e^+E^ - $ collider上累积的数据。 Dalitz情节分布和$π^+π^ - $质量谱在包括中间状态的模型中分析$ρ（770）π$，$ρ（1450）π$和$ωπ^0 $。结果，获得$ρ（770）π$和$ρ（1450）π$横截面的能量依赖性以及$ρ（770）π$振幅与$ρ（1450）π$和$ωπ^0 $ amplites之间的相对阶段。 $ρ（1450）π$横截面在$ω（1650）$共振（1.55-1.75 GEV）的能量区域中具有峰值。在此能量范围内，$ρ（770）π$和$ρ（1450）π$状态的贡献是相同的数量级。在$ρ（770）π$横截面中，没有观察到附近1.65 GEV的共振结构。我们得出的结论是，中间状态$ρ（1450）π$对$ω（1650）\toπ^+π^-π^0 $的衰减产生了重要贡献，而$ρ（770）π$机制在衰减$ω（1420）\toπ^+π^+π^-π^0 $中占主导地位。
The dynamics of the process $ e^+e^- \to π^+π^-π^0 $ is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 $e^+e^-$ collider. The Dalitz plot distribution and $π^+π^-$ mass spectrum are analyzed in a model including the intermediate states $ρ(770)π$, $ρ(1450)π$, and $ωπ^0$. As a result, the energy dependences of the $ρ(770)π$ and $ρ(1450)π$ cross sections and the relative phases between the $ρ(770)π$ amplitude and the $ρ(1450)π$ and $ωπ^0$ amplitudes are obtained. The $ρ(1450)π$ cross section has a peak in the energy region of the $ω(1650)$ resonance (1.55-1.75 GeV). In this energy range the contributions of the $ρ(770)π$ and $ρ(1450)π$ states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the $ρ(770)π$ cross section. We conclude that the intermediate state $ρ(1450)π$ gives a significant contribution to the decay of $ω(1650)\toπ^+π^-π^0$, whereas the $ρ(770)π$ mechanism dominates in the decay $ω(1420)\toπ^+π^-π^0$.
