Abstract
We have analyzed backward meson production inπ+p reactions at 20GeV/c, which were measured in the CERN Ω spectrometer triggered by a fast proton (p f ), in experiment WA56. Production via baryon exchange of quasi-two-body final statesΔ++ (1232)ρ0 (770),Δ++ (1232)f2 (1270), andΔ++ (1232)ρ 3 0 (1690) is clearly identified. The density matrix elements of meson resonances and ofΔ++ (1232) are analyzed. We have observed also the reactionsπ+p→Δ++ (1232)π0 andπ+p→Δ++ (1232)ω in thep f π+π0 andp f π+π+π−π0 final states.
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