Measurement of the e+e−→ηπ+π− cross section with the SND detector at the VEPP-2000 collider
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Abstract
The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ cross section is measured at the Spherical Neutral Detector (SND) detector in the $\ensuremath{\eta}$ decay mode $\ensuremath{\eta}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$. The analysis is based on the data sample with an integrated luminosity of $32.7\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected at the VEPP-2000 ${e}^{+}{e}^{\ensuremath{-}}$ collider in the center-of-mass energy range $\sqrt{s}=1.075--2.000\text{ }\text{ }\mathrm{GeV}$. The data obtained in the $\ensuremath{\eta}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$ decay mode are found to be in agreement with the previous SND measurements in the $\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ mode. Therefore the measurements in the two modes are combined.
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