论文标题
$ψ（2s）$衰减的振幅分离和强磁相对阶段
Amplitudes separation and strong-electromagnetic relative phase in the $ψ(2S)$ decays into baryons
论文作者
论文摘要
通过在有效的Lagrangian模型的框架内利用所有可用的数据集，获得了$ψ（2s）$衰减的强，电磁和混合的强电磁振幅。我们观察到，在$ψ（2s）$质量下，QCD制度并非完全扰动，可以通过强和混合的强电磁振幅的相对强度来推断。最近，对于$ j/ψ$衰减，也得出了类似的结论。强和电磁振幅之间的相对相为$φ=（58 \ pm 8）^\ circ $，与$φ=（73 \ pm 8）^\ circ $相比，$ J/ψ$。另一方面，在$ψ（2s）$梅森的情况下，在强度和混合的强电磁振幅之间的比值不同，在现象学上是必需的，而对于$ j/ψ$梅森来说，只有一个比率足以描述数据。最后，我们还观察到了混合的强磁振幅的特殊行为$ψ（2s）\toς^+ \ overlineσ^ - $和$ψ（2S）\toς^ - \toς^ - \ to prectlineσ^^+ $。
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 $ψ(2S)\toΣ^- \overline Σ^+$.
