Evidence for a New Meson Resonance at 2340 MeV

Abstract

Evidence is presented for a new meson resonance at 2340\ifmmode\pm\else\textpm\fi{}20 MeV, with a width of 180\ifmmode\pm\else\textpm\fi{}60 MeV, decaying primarily into $\ensuremath{\rho}\ensuremath{\rho}\ensuremath{\pi}$. The resonance, which is observed in 15-GeV/c ${\ensuremath{\pi}}^{+}p$ interactions, has isotopic spin 1 or 2 and odd $G$ parity. The cross section for production of the $\ensuremath{\rho}\ensuremath{\rho}\ensuremath{\pi}$ state is 7.3\ifmmode\pm\else\textpm\fi{}1.7 \ensuremath{\mu}b. Branching ratios into $\ensuremath{\rho}\ensuremath{\rho}\ensuremath{\pi}$ and other decay modes are given.