Observation of resonances in the reaction $\bar{p}{p}$ $\rightarrow \pi^0\eta\eta$ at 1.94$\,{GeV}/c$

The CRYSTAL BARREL Collaboration: A. Abele - et al.

doi:doi:10.1007/s100520050445

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2022 Impact factor 4.4

Particles and Fields

Eur. Phys. J. C 8, 67-79
DOI 10.1007/s100529901069

Observation of resonances in the reaction $\bar{{p}}{p}$ $\rightarrow \pi^0\eta\eta$ at 1.94 $\,{GeV}/c$

The CRYSTAL BARREL Collaboration

A. Abele ⁸ - et al.

⁸ Universität Karlsruhe, D-76021 Karlsruhe, Germany

Received: 19 July 1998 / Published online: 19 February 1999

Abstract
Antiproton-proton annihilation into $\pi^0\eta\eta$ has been studied with the Crystal Barrel spectrometer at CERN at an incident beam momentum of 1.94GeV/c. The data were taken with a trigger requiring neutral final states. A new isovector state, the a₂(1660) decaying to $\pi^0\eta$ , is observed. In the $\eta\eta$ invariant mass region around 2.1 $\,{GeV}/c^{2}$ , strong production of a heavy resonance is required, but our analysis does not distinguish between J^P = 0⁺, 2⁺ and 4⁺. The production of the f₀(1500) in reactions in flight is also observed.