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%.