Observation of tensor glueball in the reactions $p\bar p\to\pi\pi,\eta\eta,\eta\eta'$

Partial wave analysis of the reactions $p\bar p\to\pi\pi,\eta\eta,\eta\eta'$ in the region of invariant masses 1900–2400 MeV indicates to the existence of four relatively narrow tensor-isoscalar resonances $f_2(1920)$, $f_2(2020)$, $f_2(2240)$, $f_2(2300)$ and the broad state $f_2(2000)$. The determined decay couplings of the broad resonance $f_2(2000)\to\pi^0\pi^0,\eta\eta, \eta\eta'$ satisfy the relations appropriate to those of tensor glueball, while the couplings of other tensor states do not, thus verifying the glueball nature of $f_2(2000)$.