Measurements of the parameters of theφ(1020)resonance through studies of the processese+e−→K+K−,KSKL,andπ+π−π0

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Abstract

The cross sections of the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}},$ ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}{K}_{L},$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ were measured in the SND experiment at the VEPP-2M collider in the energy region near the $\ensuremath{\varphi}(1020)$ meson. These measurements were based on about ${10}^{6}$ ${K}^{+}{K}^{\ensuremath{-}},$ $0.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${K}_{S}{K}_{L},$ and $0.4\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ selected events. The measured cross sections have been analyzed in the framework of the vector meson dominance model and the main parameters of the $\ensuremath{\varphi}$ resonance were obtained, such as its mass, width, the production cross section, and branching ratios of the main decay modes. The measured value of the $\ensuremath{\varphi}$ meson total width, ${\ensuremath{\Gamma}}_{\ensuremath{\varphi}}=4.21\ifmmode\pm\else\textpm\fi{}0.04,$ is lower than the present world average of $4.458\ifmmode\pm\else\textpm\fi{}0.032$ MeV. Contributions in addition to the conventional vector meson dominance model were found in the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ reaction cross section.

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