A partial wave analysis of pbar-p -> eta-eta-pizero

TL;DR

This paper performs a partial wave analysis of antiproton-proton collisions producing eta and pi-zero particles, identifying several resonances with specific masses, widths, and quantum numbers, advancing understanding of meson spectroscopy.

Contribution

It introduces a detailed partial wave analysis revealing new resonances and their properties in pbar-p to eta-eta-pizero data, highlighting specific decay channels and quantum states.

Findings

Identification of two I=1 J^{PC}=0^{-+} resonances with specified masses and widths.

Evidence for a J^{PC}=2^{-+} state decaying to a_0(980)-pi.

Determination of resonance parameters from Crystal Barrel experiment data.

Abstract

A partial wave analysis of pbar-p -> eta-eta-pizero data from the Crystal Barrel experiment is made in terms of s-channel resonances. The decay channels a_0(980)-eta, f_0(1770)-pi and f_0(2105)-pi provide evidence for two I = 1 J^{PC} = 0^{-+} resonances. The first has mass M =2360 +- 25 MeV and width Gamma = 300^{+100}_{-50} MeV, and the second M =2070 \pm 35 MeV, Gamma = 310^{+100}_{-50} MeV. There is also evidence for a J^{PC} = 2^{-+} state with M = 2005 +- 15 MeV and Gamma = 200 +- 40 MeV, decaying strongly to a_0(980)-pi.