Properties of theζ(1480)

A novel analysis technique of $\overline{p}n$ annihilations at rest has recently brought strong evidence for a new state, called here $\zeta$, of mass 1477 ± 5 and width 116 ± 9 MeV/${\mathit{c}}^2$, which contributes dominantly to the $3{\pi }^{-}2{\pi }^{+}$ final state. An analysis has been made of the $3{\pi }^{-}2{\pi }^{+}$ considering all known intermediate states. It is found that only the cascade $\overline{p}n\to {\pi }^{-}\zeta$ and $\zeta \to 2{\rho }^0$ with $\zeta$ quantum numbers $0^{+}$, $2^{++}$ ($I^G,J^{\mathrm{PC}}$) describes $3{\pi }^{-}2{\pi }^{+}$. The product branching ratio $B(\overline{p}n\to {\pi }^{-}\zeta )B(\zeta \to 2\rho )$ is large, equal to (11.1 ± 0.8)%. The $\zeta$ is a good candidate as a quasinuclear $\overline{N}N$ bound state or as a ${\overline{Q}}^2{Q}^2$ state or, perhaps, as a glueball.