标题： 反应$pp \to ppπ^0$近阈值 显示英文标题

标题： The reaction $pp \to ppπ^0$ near threshold

摘要： 我们在动量空间中对阈值附近的反应$pp \rightarrow pp\pi ^0$进行计算。 直接产生和介子再散射都被考虑在内。 对于后者，采用了一个从$\pi N$相互作用的微观模型中得到的T矩阵。 讨论了一些在研究$ pp \rightarrow pp\pi ^0$中常用的近似方法的影响。 我们发现这些近似方法高估了截面，并且也改变了其能量依赖性。 我们得到了再散射的重要贡献，但远不足以描述数据。 显示英文摘要

摘要： We perform a momentum-space calculation of the reaction $pp \rightarrow pp\pi ^0$ near threshold. Direct production and pion rescattering are taken into account. For the latter a T-matrix obtained from a microscopic model of the $\pi N$ interaction is employed. The effects of some approximations commonly used in studies of $ pp \rightarrow pp\pi ^0$ \ are discussed. We find that those approximations overestimate the cross section and also modify its energy dependence. We obtain a significant contribution from rescattering, but not nearly enough to describe the data.