Study of Neutral Final States Produced inπ−pCollisions at Momenta of 1.71-2.46GeVc

We have studied neutral final states produced in ${\pi }^{-}p$ collisions at momenta of 1.71, 1.89, 2.07, 2.27, and 2.46 $\frac{\mathrm{GeV}}{c}$, by observing the $\gamma$ rays emitted. In particular, measurements are presented of (i) ${\pi }^{-}p\to {\pi }^{0}n$, for which the Regge-pole fit at momenta ≥5.9 $\frac{\mathrm{GeV}}{c}$ also agrees rather well here; (ii) ${\pi }^{-}p\to {\eta }^{0}n$, for which the Regge model which fits at higher energies does not agree here; (iii) ${\pi }^{-}p\to {\pi }^0\gamma n$, in which there is some evidence for a diffraction dissociation process as well as ${\omega }^0$-meson production; (iv) ${\pi }^{-}p\to {\pi }^0{\pi }^{0}n$, which is dominated by production of $N^{*0\mathrm{}}\mathrm{}\left(1236\right)\mathrm{}{\pi }^0$ and by peripheral production of pion pairs. In (iv), the former process is found to fit with the same Reggeized $\rho$-meson exchange model as charge-exchange scattering, while the latter gives indication of the $s$-wave $\pi \pi$ interaction. An account is given of new techniques, particularly in the data analysis, which were developed in the course of this work.