The reactions $pp\to pp{\pi }^0$ and $pp\to d{\pi }^{+}$ at threshold: The role of the isoscalar $\pi N$ scattering amplitude

C. Hanhart, J. Haidenbauer, M. Hoffmann +2

We examine the role of the elementary isoscalar pion--nucleon scattering amplitude in the description of the processes $pp\to pp{\pi }^0$ and $pp\to d{\pi }^{+}$ at threshold. We argue that t…