Study of the π π γ system centrally produced in the reaction pp→p( π π γ) p at 300 GeV/c.

The reaction pp→p( π π γ) p, where the π π γ system is centrally produced, has been studied at 300 GeV/c. The π π γ mass spectrum shows evidence for a ρ γ decay mode of the η′ (958) and f (1285). The branching ratio ( f(1285)→ ηπ π)/( f(1285)→ ρ γ) is found to be 5.0±0.7. No evidence is found for a ρ(770) γ decay mode of the E/f (1420) for which an upper limit BR ( E/f(1420)→ ρ γ)<0.08 at 95% CL is found. [ABSTRACT FROM AUTHOR]