标题： 从$pp$散射的阈值介子产生中确定$πNN$形状因子 显示英文标题

标题： Determination of the $πNN$ form factor from the threshold pion production of $pp$ scattering

摘要： 结果显示，由$pp$碰撞产生的$\pi^0 pp$、$\pi^+ np$和$\pi^+ d$的阈值产率可以通过一个包含介子 s 波再散射和重介子交换的$N\bar N$对项的模型一致地描述。 $\sigma^{tot} (pp\rightarrow\pi ^+ d)$和$\sigma^{tot} (pp\rightarrow\pi ^+ np)$之间的显著差异可以从氘核和$np$散射波函数的正交性来理解。 在使用巴黎势来考虑初始和最终$NN$相互作用的计算中，发现使用一个软$\pi NN$形状因子，单极形状因子为$\Lambda_{\pi} =650 $MeV 时，数据可以最好地被再现。 这与先前对$\Delta$激发区域中π介子产生的研究是一致的。 显示英文摘要

摘要： It is shown that the threshold productions of $\pi^0 pp$, $\pi^+ np$ and $\pi^+ d$ from $pp$ collisions can be consistently described by a model consisting of a pion s-wave rescattering and $N\bar N$ pair-terms of heavy-meson exchanges. The large difference between $\sigma^{tot} (pp\rightarrow\pi ^+ d)$ and $\sigma^{tot} (pp\rightarrow\pi ^+ np)$ is understood from the orthogonality of the deuteron and the $np$ scattering wave functions. In a calculation using the Paris potential to account for the initial and final $NN$ interactions, it is found that the data can be best reproduced by using a soft $\pi NN$ form factor with $\Lambda_{\pi} =650 $ MeV for a monopole form. This is consistent with an earlier study of pion production in the $\Delta$ excitation region.