Study of the $ϕ$ decays into $π^0π^0γ$ and $ηπ^0γ$ final states

2 Collaboration

doi:10.1016/S0370-2693(99)00920-X

paper

Study of the $ϕ$ decays into $π^{0} π^{0} γ$ and $η π^{0} γ$ final states

arXiv:hep-ex/9907006 · doi:10.1016/S0370-2693(99)00920-X

Abstract

Radiative decays of the $ϕ$ meson have been studied using a data sample of about 19 million $ϕ$ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected $e^{+} e^{-} \to π^{0} π^{0} γ$ and $e^{+} e^{-} \to η π^{0} γ$ events the following model independent results have been obtained: \par $B r (ϕ \to π^{0} π^{0} γ) = (0.92 \pm 0.08 \pm 0.06) \times 1 0^{- 4}$ for $M_{π^{0} π^{0}} > 700$ MeV, \par $B r (ϕ \to η π^{0} γ) = (0.90 \pm 0.24 \pm 0.10) \times 1 0^{- 4}$ . It is shown that the intermediate mechanism $f_{0} (980) γ$ dominates in the $ϕ \to π^{0} π^{0} γ$ decay and the corresponding branching ratio is \par $B r (ϕ \to f_{0} (980) γ) = (2.90 \pm 0.21 \pm 1.54) \times 1 0^{- 4}$ . The systematic error is dominated by the possible model uncertainty. \par Using the same data sample the upper limit has been obtained for the P- and CP-violating decay of $η$ at 90% CL: \par $B r (η \to π^{0} π^{0}) < 4.3 \times 1 0^{- 4}$ >.

13 pages, 6 figures, Submitted to Phys. Lett. B

Study of the $ϕ$ decays into $π^{0} π^{0} γ$ and $η π^{0} γ$ final states

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Study of the ϕ decays into π0π0γ and ηπ0γ final states

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Study of the $ϕ$ decays into $π^{0} π^{0} γ$ and $η π^{0} γ$ final states