标题： 协变四维散射方程对于$NN-πNN$系统 显示英文标题

标题： Covariant four-dimensional scattering equations for the $NN-πNN$ system

摘要： 我们使用分类图的泰勒方法的修改版本，推导出$NN-\pi NN$系统的一组耦合的四维积分方程。 这些方程是协变的，满足二体和三体幺正性，并包含减去项，这些项消除了某些先前四维$NN-\pi NN$方程中存在的重复计数。 然后通过将减去项组合在一起，将这些方程重新表述为便于计算的形式，并得到感兴趣幅值的两碎片散射方程组。 显示英文摘要

摘要： We derive a set of coupled four-dimensional integral equations for the $NN-\pi NN$ system using our modified version of the Taylor method of classification-of-diagrams. These equations are covariant, obey two and three-body unitarity and contain subtraction terms which eliminate the double-counting present in some previous four-dimensional $NN-\pi NN$ equations. The equations are then recast into a from convenient for computation by grouping the subtraction terms together and obtaining a set of two-fragment scattering equations for the amplitudes of interest.