Study of dynamics of the process [Formula omitted] in the energy range 1.15-2.00 GeV

The dynamics of the process [Formula omitted] is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 [Formula omitted] collider. The Dalitz plot distribution and [Formula omitted] mass spectrum are analyzed in a model including the intermediate states [Formula omitted], [Formula omitted], and [Formula omitted]. As a result, the energy dependences of the [Formula omitted] and [Formula omitted] cross sections and the relative phases between the [Formula omitted] amplitude and the [Formula omitted] and [Formula omitted] amplitudes are obtained. The [Formula omitted] cross section has a peak in the energy region of the [Formula omitted] resonance (1.55-1.75 GeV). In this energy range the contributions of the [Formula omitted] and [Formula omitted] states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the [Formula omitted] cross section. We conclude that the intermediate state [Formula omitted] gives a significant contribution to the decay of [Formula omitted], whereas the [Formula omitted] mechanism dominates in the decay [Formula omitted].