Analysis of e + e −→π+π−π+π− and e + e −→π+π−π0π0 processes in the energy range of $$\sqrt 2 = 0.98 - 1.38 GeV$$ in experiments with a spherical neutral detector

Abstract

The cross sections of the e+e−→π+π−π +π−, e+e−→π+π−π0π 0, and e+e−→ωπ→ π+π−π 0π0 processes, as well as the e+e−→π+π−π0π0 process with subtracted contribution of the ωπ intermediate state, are measured in experiments with a spherical neutral detector on the VEPP-2M collider in the energy range 0.98–1.38 GeV. About 41 000 events of the e+e−→π+π−π+π − process and more than 54 000 events of the e+e−→π+π −π0π0 process have been selected in experiment. The statistical error in determining the cross section is 2–20%, while the systematic error is 7 and 8%.