Phys. Rev. Lett. 112, 251801 (2014) - Observation of $\ensuremath{\eta}\ensuremath{'}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\eta}\ensuremath{'}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$

Observation of $η' \to π^{+} π^{-} π^{+} π^{-}$ and $η' \to π^{+} π^{-} π^{0} π^{0}$

M. Ablikim et al.

Phys. Rev. Lett. 112, 251801 – Published 25 June 2014; Erratum Phys. Rev. Lett. 113, 039903 (2014)

Abstract

Using a sample of $1.3 \times 10^{9} J / ψ$ events collected with the BESIII detector, we report the first observation of $η^{'} \to π^{+} π^{-} π^{+} π^{-}$ and $η^{'} \to π^{+} π^{-} π^{0} π^{0}$ . The measured branching fractions are $B (η^{'} \to π^{+} π^{-} π^{+} π^{-}) = [8.53 \pm 0.69 (stat.) \pm 0.64 (syst.)] \times 10^{- 5}$ and $B (η^{'} \to π^{+} π^{-} π^{0} π^{0}) = [1.82 \pm 0.35 (stat.) \pm 0.18 (syst.)] \times 10^{- 4}$ , which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vector-meson dominance.