利用CMD-3探测器在质心能量范围1.6 - 2.0 GeV内对过程$e^+e^-\to π^+π^-π^0π^0η$的研究
Study of the proccess $e^+e^-\to π^+π^-π^0π^0η$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector
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- Budker Institute of Nuclear Physics, SB RAS(布德克尔核物理研究所)
- Novosibirsk State University(新西伯利亚国立大学)
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中文总结 AI 辅助
该研究利用CMD - 3探测器在质心能量1.6 - 2.0 GeV收集的数据样本,测量$e^+e^-\to π^+π^-π^0π^0η$过程截面,分析产生动力学,发现$\omega(782)\pi^0\eta$主导,还有其他共振贡献,为相关研究提供了数据和结论。
中文摘要 AI 辅助
利用在VEPP - 2000正负电子对撞机上用CMD - 3探测器收集的积分亮度为372 pb⁻¹的数据样本,测量了过程$e^+e^-\to π^+π^-π^0π^0η$的截面。在质心能量范围1.6 - 2.0 GeV内选择了6300±145个信号事件。截面的总系统不确定性约为10%。产生动力学主要由$\omega(782)\pi^0\eta$末态主导,$\pi^0\eta$组合中可能有小的$a_0(980)$共振贡献。还在$\pi^{\pm}\pi^0$不变质量分布中观察到$\rho(770)^{\pm}$共振信号的存在。
英文摘要
The cross section of the process $e^+e^- \to π^+π^-π^0π^0η$ has been measured using a data sample with the integrated luminosity of 372 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 6300$\pm$145 signal events have been selected in the center-of-mass energy range 1.6--2.0 GeV. The total systematic uncertainty of the cross section is about 10\%. The production dynamics is dominated by the $ω(782)π^0η$ final state with a possible small contribution of the $a_0(980)$ resonance in the $π^0η$ combination. We also observe a presence of the $ρ(770)^{\pm}$ resonance signal in the $π^{\pm}π^0$ invariant mass distribution.