Combined analysis of meson channels with I=1, C = -1 from 1940 to 2410 MeV

TL;DR

This paper reports new measurements of meson resonance parameters from pbar-p annihilation data, improving resonance properties and revealing phase relationships through polarization analysis.

Contribution

It provides updated resonance masses, widths, and polarization data, with systematic cross-checks, advancing understanding of meson channels with I=1, C=-1 in the 1940-2410 MeV range.

Findings

Resonance parameters are refined with new data.

Vector polarization P_y is near zero, indicating phase coherence.

Large tensor polarizations observed.

Abstract

New Crystal Barrel data are reported for pbar-p -> omega-pizero and pbar-p -> omega eta-pizero with omega decaying to piplus-piminus-pizero. The shapes of angular distributions agree well with those for data where omega -> pizero-gamma; this is a valuable cross-check on systematic errors. The new data provide good measurements of vector and tensor polarisations P_y, T20, T21 and T22 of the omega. These lead to significant improvements in parameters of several resonances reported earlier. New values of masses and widths (in Mev) are: J^PC = 5^-- (2300+-45, 260+-75), J^PC = 3^-- (2260+-20, 160+-25), J^PC = 1^+- (2240+-35, 320+-85), and J^PC = 1^-- (2110+-35, 230+-50). A remarkable feature of the data is that vector polarisation P_y is close to zero everywhere. It follows that all interfering amplitudes have relative phases close to 0 or 180 deg. Tensor polarisations are large.