标题： 介子交换和π介子重散射对$pp\to ppπ^0$截面的贡献 显示英文标题

标题： Meson Exchange and Pion Rescattering Contributions to the Cross Section for $pp\to ppπ^0$

摘要： 短程介子交换机制，例如 $\rho\to\omega\pi^0$，除了π介子重散射外，在近阈值处对 $pp\rightarrow pp\pi^0$ 的振幅有显著贡献。 后者贡献的不确定性，这取决于一些难以确定的参数，被估计出来。 考虑到这种不确定性并计入短程介子交换贡献，就可以重现测量到的截面。 显示英文摘要

摘要： Short range meson-exchange mechanisms such as $\rho\to\omega\pi^0$ contribute significantly to the amplitude for $pp\rightarrow pp\pi^0$ near threshold in addition to pion rescattering. The uncertainty of the latter contribution, which depends on poorly determined parameters, is estimated. Allowing for this uncertainty and taking the short range meson-exchange contributions into account makes it possible to reproduce the measured cross section.