Search for $f_1(1285) \to π^+π^-π^0$ decay with VES detector

Abstract

The isospin violating decay $f_1(1285)\toπ^+π^-π^0$ has been studied at VES facility. This study is based at the statistics acquired in $π^- Be$ interactions at 27, 36.6 and 41 GeV/c in diffractive reaction $π^- N \to (f_1 π^-) N$. The $f_1(1285) \to π^+π^-π^0$ decay is observed. The ratio of decay probabilities $BR(f_1(1285) \to π^+π^-π^0)$ to $BR(f_1(1285) \to ηπ^+π^-) \cdot BR(η\to γγ)$ is $\sim\:1.4%$.

10 pages, 8 figures, presented at XII Conference on Hadron Spectroscopy