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A partial wave analysis of antiproton-proton annihilation data in flight at900 $MeV/c$ into $\pi^0 \pi^0 \eta$ , $\pi^0 \eta \eta$ and $K^+ K^- \pi^0$ ispresented. The data were taken at LEAR by the Crystal Barrel experiment in1996. The three channels have been coupled together with $\pi\pi$-scatteringisospin I=0 S- and D-wave as well as I=1 P-wave data utilizing the K-matrixapproach. Analyticity is treated using Chew-Mandelstam functions. In the fitall ingredients of the K-matrix, including resonance masses and widths, weretreated as free parameters. In spite of the large number of parameters, the fitresults are in the ballpark of the values published by the Particle Data Group.In the channel $\pi^0 \pi^0 \eta$ a significant contribution of the spin exotic$I^G=1^-$ $J^{PC}=1^{-+}$ $\pi_1$-wave with a coupling to $\pi^0 \eta$ isobserved. Furthermore the contributions of $\phi(1020) \pi^0$ and $K^*(892)^\pmK^\mp$ in the channel $K^+ K^- \pi^0$ have been studied in detail. Thedifferential production cross section for the two reactions and thespin-density-matrix elements for the $\phi(1020)$ and $K^*(892)^\pm$ have beenextracted. No spin-alignment is observed for both vector mesons. The spindensity matrix elements have been also determined for the spin exotic wave.

Coupled Channel Analysis of $\bar{p} p \rightarrow \pi^0 \pi^0 \eta$,  $\pi^0 \eta \eta$ and $K^+ K^- \pi^0$ at 900 $MeV/c$ and of  $\pi\pi$-Scattering Data