OMEGA PRODUCTION IN PI+DELTA-PI+PI-PI DEGREES PP AT 4.19 GEV/C

We report on ∼340 events of the reaction π+n→ω0p at a beam momentum of 4.19 GeV/c. The differential cross section shows neither a broad dip for t<-0.2 (GeV/c)2 nor a dip in the region t-0.6 (GeV/c)2. There is a 2-standard-deviation dip in ρ00 between t=-0.2 and t=-0.3 (GeV/c)2 and a small negative value of Reρ10 for t<-1.0 (GeV/c)2. The dip in ρ00 is consistent with the vanishing, in that region of t, of an exchanged trajectory with unnatural parity. A simple Regge-model calculation with ρ+B exchange does not reproduce the data. © 1969 The American Physical Society.