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

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

1999-07-07

arxiv.org/abs/hep-ex/9907006v1

Phys.Lett.B462:380,1999

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/S0370-2693(99)00920-X

Radiative decays of the $\phi$ meson have been studied using a data sample of about 19 million $\phi$ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected $e^+e^-\to\pi^{0}\pi^{0}\gamma$ and $e^+e^-\to\eta\pi^{0}\gamma$ events the following model independent results have been obtained: \par $Br(\phi\to\pi^{0}\pi^{0}\gamma) = (0.92\pm 0.08\pm0.06)\times10^{-4}$ for $M_{\pi^{0}\pi^{0}}>700$ MeV, \par $Br(\phi\to\eta\pi^{0}\gamma) = (0.90\pm 0.24\pm 0.10)\times10^{-4}$. It is shown that the intermediate mechanism $f_{0}(980)\gamma$ dominates in the $\phi\to\pi^{0}\pi^{0}\gamma$ decay and the corresponding branching ratio is \par $Br(\phi\to f_{0}(980)\gamma)=(2.90\pm 0.21\pm1.54)\times10^{-4}$. 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 $\eta$ at 90% CL: \par $Br(\eta\to\pi^{0}\pi^{0}) < 4.3\times10^{-4}$ >.

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