Measurement of the e+e−→π+π−π0η cross section below s=2 GeV

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Abstract

The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\eta}$ is studied in the center-of-mass energy region below 2 GeV with the SND detector at the VEPP-2000 ${e}^{+}{e}^{\ensuremath{-}}$ collider. The following four intermediate states contribute to this process: $\ensuremath{\omega}\ensuremath{\eta}$, $\ensuremath{\phi}\ensuremath{\eta}$, ${a}_{0}(980)\ensuremath{\rho}$, and a structureless ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\eta}$ state. We measure the total ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\eta}$ cross section and the cross sections for its components: $\ensuremath{\omega}\ensuremath{\eta}$, $\ensuremath{\phi}\ensuremath{\eta}$, and a sum of ${a}_{0}(980)\ensuremath{\rho}$ and the structureless state. Our results are in agreement with previous measurements and have comparable or better accuracies.

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