Observation of the tensor glueball

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Abstract
In the reactions p-p → π 0 π 0, ηη, ηη′, in the mass region 1900–2400 MeV there are four relatively narrow resonances f 2(1920), f 2(2020), f 2(2240), and f 2(2300) and a broad one f 2(2000). In the framework of quark combinatorics, we carry out an analysis of the decay constants for all five resonances. It is shown that the relations for the decay constants corresponding to the broad resonance f 2(2000) → π 0 π 0, ηη, ηη′ are the same as those corresponding to a glueball. An additional argument in favor of the glueball nature of f 2(2000) is the fact that f 2(1920), f 2(2020), f 2(2240), and f 2(2300) fit well the q-q trajectories in the (n, M 2) plane (where n is the radial quantum number), while the broad f 2(2000) resonance turns out to be an unnecessary extra state for these trajectories.