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arXiv 2005.11265hep-ph
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$ψ(2S)$衰变为重子的振幅分离和强电磁相对相位

Amplitudes separation and strong-electromagnetic relative phase in the $ψ(2S)$ decays into baryons

Rinaldo Baldini Ferroli, Alessio Mangoni, Simone Pacetti, Kai Zhu

备注：
7 pages, 3 figures
发表信息：
Phys. Rev. D 103, 016005 (2021)
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摘要：

在有效的拉格朗日模型框架下，利用现有的实验数据，得到了$ψ(2S)$衰变为重子-反重子对的强、电磁和混合强电磁振幅。我们观察到，在$ψ(2S)$质量的QCD制度是不完全微扰，可以推断出的相对强度的强和混合强电磁振幅。最近，对于$J/ψ$衰变也得到了类似的结论。强振幅和电磁振幅之间的相对相位是$φ= (58\pm 8)^\circ$，与针对$J/ψ$获得的$φ= (73\pm 8)^\circ$进行比较。另一方面，在$ψ(2S)$介子的情况下，强电磁振幅和混合强电磁振幅之间的比率的不同值是唯象需要的，而对于$J/ψ$介子，只有一个比率足以描述数据。最后，我们还观察到了衰变$ψ(2S)\toΣ^+ \overline Σ^-$和$ψ(2S)\toΣ^- \overline Σ^+$的混合强电磁振幅的特殊行为。

英文摘要：

The strong, electromagnetic and mixed strong-electromagnetic amplitudes of the $ψ(2S)$ decays into baryon-anti-baryon pairs have been obtained by exploiting all available data sets in the framework of an effective Lagrangian model. We observed that at the $ψ(2S)$ mass the QCD regime is not completely perturbative, as can be inferred by the relative strength of the strong and the mixed strong-electromagnetic amplitudes. Recently a similar conclusion has been reached also for the $J/ψ$ decays. The relative phase between the strong and the electromagnetic amplitudes is $φ= (58\pm 8)^\circ$, to be compared with $φ= (73\pm 8)^\circ$ obtained for the $J/ψ$. On the other hand, in the case of the $ψ(2S)$ meson, different values of the ratio between strong and mixed strong-electromagnetic amplitudes are phenomenologically required, while for the $J/ψ$ meson only one ratio was enough to describe the data. Finally, we also observed a peculiar behavior of the mixed strong-electromagnetic amplitudes of the decays $ψ(2S)\toΣ^+ \overline Σ^-$ and $ψ(2S)\toΣ^- \overline Σ^+$.

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