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arXiv 1601.08061hep-ex
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在VEPP-2M对撞机上用SND探测器研究$e^+e^- \to π^0γ$反应

Study of the reaction $e^+e^- \to π^0γ$ with the SND detector at the VEPP-2M collider

M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba. E. … 展开作者

M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba. E. V. Pakhtusova, S. I. Serednyakov, Yu. M. Shatunov, Z. K. Silagadze, A. N. Skrinsky, Yu. V. Usov, A. V. Vasiljev

摘要:

在VEPP-2 M $e^+e^-$对撞机上用SND探测器对过程$e^+e^- \to π^0γ$进行了实验研究。$e^+e^- \to π^0γ$截面已被测量的质心能量范围从0.60到1.38 GeV。用矢量介子优势模型很好地描述了截面。根据对截面数据的拟合,我们确定了分支分数$B(ρ\toπ^0γ)=(4.20\pm0.52)\times10^{-4}$、$B(ω\toπ^0γ)=(8.88\pm0.18)\%$、$B(ϕ\toπ^0γ)=(1.367\pm0.072)\times10^{-3}$以及$ρ$和$ω$振幅之间的相对相位$φ_ρ=(-12.7\pm4.5)^\circ$。我们关于工艺$e^+e^- \to π^0γ$的数据是迄今为止最准确的。

英文摘要:

The process $e^+e^- \to π^0γ$ has been studied in the experiment with the SND detector at the VEPP-2M $e^+e^-$ collider. The $e^+e^- \to π^0γ$ cross section has been measured in the center-of-mass energy range from 0.60 to 1.38 GeV. The cross section is well described by the vector meson dominance model. From the fit to the cross section data we have determined the branching fractions $B(ρ\toπ^0γ)=(4.20\pm0.52)\times10^{-4}$, $B(ω\toπ^0γ)=(8.88\pm0.18)\%$, $B(ϕ\toπ^0γ)=(1.367\pm0.072)\times10^{-3}$, and the relative phase between the $ρ$ and $ω$ amplitudes $φ_ρ=(-12.7\pm4.5)^\circ$. Our data on the process $e^+e^- \to π^0γ$ are the most accurate to date.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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