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Observation of resonances in the reaction ${\rm \bar p p} \rightarrow \pi^0\eta\eta$ at 1.94 GeV/$c^2$

A. Abele et al.,A. Abele,B. Adomeit,C. Amsler,M. Benayoun,A. Berdoz,K. Beuchert,S. Bischo,K. Braune,T. Case,O. Cramer,V. Crede,T. Degener,N. Djaoshvili,M. Doser,A. Ehmanns,D. Engelhardt,P. Giaritta,M. Heinzelmann,A. Herbstrith,M. Herz,P. Hidas,D. Jamnik,H. Kalinowsky,P. Kammel,J. Kisiel,E. Klempt,M. Kunze,U. Kurilla,M. Lakata,R. Landua,R. McCrady,J. Meier,R. Ouared,F. Ould-Saada,K. Peters,B. Pick,C. Pietra,M. Ratajczak,C. Regenfus,S. Resag,P. Schmidt,R. Seibert,S. Spanier,H. St,C. Straburger,U. Strohbusch, M. Suert,U. Thoma,I. Uman,S. Wallis-Plachner,D. Walther,K. Wittmack

msra（1999）

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Abstract
.   Antiproton–proton annihilation into has been studied with the Crystal Barrel spectrometer at CERN at an incident beam momentum of 1.94 GeV/c. The data were taken with a trigger requiring neutral final states. A new isovector state, the decaying to , is observed. In the invariant mass region around 2.1 GeV/, strong production of a heavy resonance is required, but our analysis does not distinguish between , and . The production of the in reactions in flight is also observed.
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