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Observation of a 1750 MeV narrow meson decaying into ηη

D. Alde,F. Binon,C. Bricman,S.V. Donskov,M. Gouanère,A.V. Inyakin,V.A. Kachanov,D.B. Kakauridze,G.V. Khaustov,E.A. Knapp,A.V. Kulik,J.P. Lagnaux,A.A. Lednev,Yu.V. Mikhailov,Th. Mouthuy,J.P. Peigneux,Yu.D. Prokoshkin,Yu.V. Rodnov,S.A. Sadovsky,V.D. Samoilenko

Physics Letters B（1986）

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Abstract
A narrow meson which decays into ηη is observed in 38 GeV/c π−p collisions at large momentum transfer. The experiment has been performed at the Serpukhov accelerator with the GAMS-2000 spectrometer. The mass of this new meson is (1755 ± 8) MeV, its width is less than 50 MeV. Its spin-parity is JPC=0++ or less probably 2++.
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