I=0, C=−1 mesons from 1940 to 2410 MeV

Abstract

New Crystal Barrel data are reported for p ̄ p→ωη and p ̄ p→ωπ 0π 0 with ω decaying to π + π − π 0. The ωη data confirm angular distributions obtained earlier from data where ω→ π 0 γ. The new ωη data provide accurate measurements of vector and tensor polarisations of the ω and lead to considerable improvements in masses and widths of s-channel resonances. A new J PC =3 +− I=0 resonance is observed with mass M=2025±20 MeV and width Γ=145±30 MeV. Polarisation is close to zero everywhere and tensor polarisations are large, as is the case also for p ̄ p→ωπ 0 .