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

TL;DR

This paper reports new experimental data on meson production in antiproton-proton collisions, leading to improved measurements of resonance properties and the discovery of a new resonance state.

Contribution

It provides new high-precision measurements of meson resonance parameters and reports the observation of a previously unconfirmed J^PC = 3^+- I = 0 resonance.

Findings

Confirmation of angular distributions for omega-eta production

Accurate measurements of omega polarization states

Discovery of a new resonance at 2025 MeV with specified width

Abstract

New Crystal Barrel data are reported for pbar-p -> omega-eta and pbar-p -> omega-pizero-pizero with omega decaying to piplus-piminus-pizero. The omega-eta data confirm angular distributions obtained earlier from data where omega -> pizero-gamma. The new omega-eta data provide accurate measurements of vector and tensor polarisations of the omega 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 Gamma = 145+-30 MeV. Polarisation is close to zero everywhere and tensor polarisations are large, as is the case also for pbar-p -> omega-pizero.