论文标题
$ n \ bar {n} $生产$ e^{+} e^{ - } $ nihilation在重新访问阈值附近
$N\bar{N}$ production in $e^{+}e^{-}$ annihilation near the threshold revisited
论文作者
论文摘要
$ p \ bar {p} $和$ n \ bar {n} $ pairs in $ e^{+} e^{ - } $ nihilation在该过程阈值附近的nihilation in the Proce threshold of Acracte the Process the Process的新实验数据进行了讨论。由于这些新数据的很大一部分是在明显超过阈值的能量中获得的，因此我们还考虑了描述$ n \ bar {n} $配对生产幅度的尺寸。有效的光电位描述了$ n \ bar {n} $生产横截面的急剧依赖性，包括$ s $和$ d $ waves的核心潜力以及张量的潜力。这些潜力在isospin $ i = 0 $和$ i = 1 $ of $ n \ bar {n} $配对的情况下有所不同。光学潜力描述了很好的$ n \ bar {n} $散射阶段，$ p \ bar {p} $的横截面和$ n \ bar {n} $生产在$ e^{+} e^{+} e^{ - } $ enhihilation中，附近，thereshold，thereshold，threshold，threshold，$ g_ for g_ for g_ for g_ for g_ g_ g_ g_ g_ g_ g_ {e g_ {e g_ {该过程的交叉部分$ e^{+} e^{ - } \to6π$和$ e^{+} e^{ - } \ to k^{+} k^{ - }π^{+}+}π^{ - } $。
Production of $p\bar{p}$ and $n\bar{n}$ pairs in $e^{+}e^{-}$ annihilation near the threshold of the process is discussed with account for the new experimental data appeared recently. Since a significant part of these new data was obtained at energies noticeably exceeding the threshold, we also take into account the form factor describing the amplitude of $N\bar{N}$ pair production at small distances. The effective optical potential, which describes a sharp dependence of the $N\bar{N}$ production cross sections near the threshold, consists of the central potential for $S$ and $D$ waves and the tensor potential. These potentials differ for the states with isospin $I=0$ and $I=1$ of $N\bar{N}$ pair. The optical potential describes well $N\bar{N}$ scattering phases, the cross sections of $p\bar{p}$ and $n\bar{n}$ production in $e^{+}e^{-}$ annihilation near the threshold, the electromagnetic form factors $G_{E}$ and $G_{M}$ for protons and neutrons, as well as the cross sections of the processes $e^{+}e^{-}\to6π$ and $e^{+}e^{-}\to K^{+}K^{-}π^{+}π^{-}$.
