Measurement of Neutral-Meson Production inπ−p+π−pX0at 13.4 GeV/c

We have measured, by the missing-mass technique, spectra of the neutral-meson system $X^0$ produced in ${\pi }^{-}p\to {\pi }^{-}p{X}^0$ at 13.4 GeV/c. The ${\pi }^0$, ${\rho }^0$, and ${\omega }^0$ appear as well as a broad enhancement at 450 MeV and a narrow peak at 1280 MeV which is interpreted as the $D^0$. Most of the ${\pi }^0$ signal and the events around 450 MeV are correlated with $N^{*+}$ production. The ${\rho }^0$ peak results primarily from ${A_1}^{-}-{A_2}^{-}$ decays. We find, however, that the ${\omega }^0$ and $D^0$ are largely uncorrelated with $N^{*+}$ or $X^{-}$ resonances.