Study of pbar-p -> eta-eta-pizero-pizero in flight

TL;DR

This paper analyzes pbar-p collisions producing eta-eta-pizero-pizero, revealing a new resonance at 1880 MeV with specific decay modes, contributing to understanding meson spectroscopy.

Contribution

It reports the discovery of a new I=1, J^PC=2^-+ resonance at 1880 MeV with strong decay to a2(1320)-eta, and provides evidence for additional decay channels.

Findings

Evidence for a 1880 MeV resonance with 255 MeV width

Resonance decays strongly to a2(1320)-eta

Tentative decay evidence to f0(1500)pi

Abstract

An analysis of data on pbar-p -> eta-eta-pizero-pizero is presented at pbar beam momenta 600 to 1940 MeV/c. There is evidence for an I = 1, J^PC = 2^-+ resonance in eta-eta-pizero with mass M = 1880 +- 20 MeV and width 255 +- 45 MeV, decaying strongly a2(1320)-eta; it is too strong to be explained as the high mass tail of \pi_2(1670) -> a2(1320)-eta. There is tentative evidence also for weak decays to f_0(1500)\pi. It makes a natural partner to the eta 2(1860).