Reactionπ−p→ϕϕnand Evidence for Glueballs

The authors have detected 1203 events of the reaction ${\pi }^{-}p\to \varphi \varphi n$ at 22 GeV/c, and have performed a partial-wave analysis of the $\varphi \varphi$ system. The results are well represented by two resonances, both with quantum numbers $I^G=0^{+}$, $J^{\mathrm{PC}}=2^{++}$. The breakdown of the Okubo-Zweig-Iizuka suppression observed in this reaction is naturally explained in the context of QCD if these states are considered to be glueball candidates.