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VOLUME 44 (1986) | ISSUE 10 | PAGE 441
Observation of a narrow meson with a mass of 1750 MeV which decays into two η mesons
A meson with a small width which is produced in π~ρ collisions and which decays into an ηη pair has been discovered. The experiment was carried out with the GAMS-2000 multiphoton hodoscopic spectrometer in the pion beam at the Serpukhov accelerator at a momentum of 38 GeV/c. The mass of this new meson state is 1755 + 8 MeV, and its width does not exceed 50 MeV. The spin and parity are Jpc = 0+ + or, less probably, 2 + +. The isospin and G-parity are 0 +. The production cross section, aBR, has been found to be 3.5 ± 1.5 nb. The t dependence of the cross section is described by exp (bt) with a slope b = 3.8 + 1.5 (GeV/сГ2.