Measurement of the $e^+e^- \to ηπ^+π^-$ cross section with the SND detector at the VEPP-2000 collider

Abstract

The $e^+e^- \to ηπ^+π^-$ cross section is measured at the SND detector in the $η$ decay mode $η\to 3π^0$. The analysis is based on the data sample with an integrated luminosity of 32.7 pb$^{-1}$ collected at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range $\sqrt{s}=1.075-2.000$ GeV. The data obtained in the $η\to 3π^0$ decay mode are found to be in agreement with the previous SND measurements in the $η\to γγ$ mode. Therefore the measurements in the two modes are combined.

8 pages, 5 figures