Abstract
Evidence for a new meson decaying into ηη′ has been found in 38 GeV π −p charge-exchange interactions. The mass and the width of this meson are (1917 ± 15) MeV and (90 −50 +35) MeV, respectively. Possible spin and parity assignments are J PC = 0 ++, 1 −+ or 2 ++, isospin and G-parity are I G = 0 +. The t-dependence of the differential cross section follows an exponential behaviour exp( bt with a small slope: b = (2±1) (GeV/ c) −2.Upper limits on its decay into ππ, ηη and K K exotic interpretation of this meson.
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