在美因茨微子加速器上对 $\pi^0 \to e^+e^-\gamma$ 达利兹衰变的新高统计量测量
New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron
AI总结:
基于γp→π0p反应,在MAMI上以2.4×10^6个事例高统计测量π0→e+e-γ达利兹衰变,得到电磁跃迁形状因子斜率参数aπ=0.0315±0.0026stat±0.0010syst,精度优于此前结果。
摘要:
达利兹衰变 $\pi^0 \to e^+e^-\gamma$ 已在美因茨微子加速器 MAMI 的 A2 标记光子设施中,通过 $\gamma p\to \pi^0 p$ 反应以迄今最高的统计精度进行了测量。从 $2.4\times10^6$ 个观测到的 $\pi^0 \to e^+e^-\gamma$ 衰变分析中,得到了 $\pi^0$ 电磁跃迁形状因子的斜率参数 $a_\pi=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$。在实验不确定度范围内,该结果与现有测量和理论计算一致,且其自身不确定度小于以往基于 $\pi^0\to e^+e^-\gamma$ 衰变分析的结果。
英文摘要:
The Dalitz decay $π^0 \to e^+e^-γ$ has been measured with the highest statistical accuracy obtained so far in the $γp\to π^0 p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value of the slope parameter for the $π^0$ electromagnetic transition form factor, $a_π=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$, is obtained from the analysis of $2.4\times10^6$ $π^0 \to e^+e^-γ$ observed decays. Within experimental uncertainties, it is in agreement with existing measurements and theoretical calculations, with its own uncertainty being smaller than previous results based on the analysis of $π^0\to e^+e^-γ$ decays.
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